{"id":44306,"date":"2022-01-15T00:24:01","date_gmt":"2022-01-14T18:54:01","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=44306"},"modified":"2022-01-16T12:02:27","modified_gmt":"2022-01-16T06:32:27","slug":"frank-icse-class-10-physics-solutions-modern-physics","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-materials\/physics\/frank-icse-class-10-physics-solutions-modern-physics\/","title":{"rendered":"Frank ICSE Class 10 Physics Solutions Modern Physics"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/physics\/frank-icse-class-10-physics-solutions-modern-physics\/#Frank_ICSE_Class_10_Physics_Solutions_Modern_Physics\" title=\"Frank ICSE Class 10 Physics Solutions Modern Physics\">Frank ICSE Class 10 Physics Solutions Modern Physics<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/physics\/frank-icse-class-10-physics-solutions-modern-physics\/#Frank_ICSE_Class_10_Physics_Solutions_Modern_Physics-2\" title=\"Frank ICSE Class 10 Physics Solutions Modern Physics\">Frank ICSE Class 10 Physics Solutions Modern Physics<\/a><ul class='ez-toc-list-level-4'><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/physics\/frank-icse-class-10-physics-solutions-modern-physics\/#Frank_ICSE_Class_10_Physics_Solutions_Modern_Physics_Radioactivity\" title=\"Frank ICSE Class 10 Physics Solutions Modern Physics Radioactivity\">Frank ICSE Class 10 Physics Solutions Modern Physics Radioactivity<\/a><ul class='ez-toc-list-level-5'><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/physics\/frank-icse-class-10-physics-solutions-modern-physics\/#Frank_ICSE_Class_10_Physics_Solutions_Modern_Physics-3\" title=\"Frank ICSE Class 10 Physics Solutions Modern Physics\">Frank ICSE Class 10 Physics Solutions Modern Physics<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Frank_ICSE_Class_10_Physics_Solutions_Modern_Physics\"><\/span><strong><span style=\"color: #4dbdff;\">Frank ICSE Class 10 Physics Solutions Modern Physics<\/span><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Frank_ICSE_Class_10_Physics_Solutions_Modern_Physics-2\"><\/span>Frank ICSE Class 10 Physics Solutions Modern Physics<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong><span style=\"color: #eb4924;\">Frank ICSE Class 10 Physics Solutions Modern Physics ThermIonic Emission and Cathode Ray Physics<\/span><\/strong><br \/>\n<strong><span style=\"color: #4dbdff;\">PAGE NO-271:<\/span><\/strong><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 1<\/span><\/strong><br \/>\nThe minimum amount of energy required to emit electrons from a metal surface is called work function of that material.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 2<\/span><\/strong><br \/>\nThe electrons in the outer orbits are weakly attracted by the nucleus and are loosely bound. When a solid is formed, the loosely bound electrons leave their individual atom and become a part of the solid as a whole. They are called conduction electrons.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 3<\/span><\/strong><br \/>\nwhen certain metals are heated to a high temperature, they emit thermions (electrons) and the phenomenon is called thermionic emission. Thermionic emission can be used to produce cathode rays oscilloscope.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 4<\/span><\/strong><br \/>\nRate of emission of electrons from a heated surface depends upon:(i) Work function of the material.(ii)Melting point of the material.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 5<\/span><\/strong><br \/>\nMaterials of low work function are preferred as electron emitters because they emit electrons even at a low temperature.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 6<\/span><\/strong><br \/>\nWork function of a material is generally expressed in electron volt (eV).1 eV = 1.6 ?10<sup>-19<\/sup> J.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 7<\/span><\/strong><br \/>\n(i)Electrons are the charged particles.<br \/>\n(ii)Amount of charge on each particle is 1.6 ? 10<sup>-19<\/sup> J.<br \/>\n(iii)Approximately 3000 V of voltage is applied to heat the filament.<br \/>\n(iv)Potential difference V<sub>1<\/sub> applied between the anode and filament is few hundred volts.<br \/>\n(v)Beam of electrons gets deflected when it passes through the magnetic field.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128748\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-1.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 1\" width=\"387\" height=\"172\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 8<\/span><\/strong><br \/>\nPressure inside a cathode ray tube should be kept very low because cathode rays are made up of electrons and mass of electrons are very low. If air exists inside the cathode ray tube then electrons would be deflected by air molecules and cathode would not be able to strike on screen properly.So pressure inside cathode ray tube should be kept very low.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 9<\/span><\/strong><br \/>\nA layer of graphite is made on the inner side of the cathode ray tube close to the fluorescent screen. As a result of impacting electrons, the screen acquires a negative charge. To reduce this effect, the graphite is electrically connected to \u2018earth\u2019 (zero volts).This allows excess charge to drain away. Otherwise the accumulated charge would reduce the numbers of electrons arriving at the screen, reducing brightness.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 10<\/span><\/strong><br \/>\nBrightness of the pattern on the screen of CRT can be controlled by varying the potential applied to the cathode.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 11<\/span><\/strong><br \/>\nCathode ray tube has three main sections<\/p>\n<p>(i) Electron gun : arrangement of electrodes where a stream of electrons is produced is known as electron gun<br \/>\n(ii)Deflection system: Stream of emerging electrons is deflected in its passage between the gun and the screen. This deflection is produced by two pairs of parallel plates arranged at right angles.<br \/>\n(iii)Fluorescent screen: At the end of the tube screen is coated with a mixture of fluorescent material and phosphorescent material. The phosphorescent material is responsible for the persistence of the image on the screen.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 12<\/span><\/strong><br \/>\n(i)If hotter filament is used then no of electron would increase and a brightness of the spot on the screen would increase.(ii)If anode voltage is increased then this would collimate the beam into a narrower, faster stream of electrons, producing a smaller, sharper dot on the screen.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 13<\/span><\/strong><br \/>\n(i) Cathode ray tubes are used in science research laboratories by scientist for converting electrical signals into visual signals and television tubes.<br \/>\n(ii) Cathode ray tubes are used by doctors for converting electrical impulses corresponding to heart beats into visual signals in ECG, EEG etc.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 14<\/span><\/strong><br \/>\nThe end of the tube screen is coated with a mixture of fluorescent material and phosphorescent material. The phosphorescent material is responsible for the persistence of the image on the screen. While fluorescence material coated inside screen is responsible for production of bright spot on the screen when electron beam strikes on the screen.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 15<\/span><\/strong><br \/>\nIn presence of electric field, beam of electrons experience a force and deflected towards the positive plate. The path is parabolic within the electric field and after electric field the beam of electron travels straight.In presence of magnetic field, the electrons experience a force, the direction of which is given by Fleming left hand rule. The beam of electrons gets deflected and follows a circular path. The magnetic field is perpendicular to the plane of paper inwards and is represented X. On emergence from the magnetic field, they travel along a straight path in opposite direction to their velocity.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128750\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-2.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 2\" width=\"347\" height=\"142\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128751\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-3.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 3\" width=\"290\" height=\"167\" \/><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Frank_ICSE_Class_10_Physics_Solutions_Modern_Physics_Radioactivity\"><\/span><strong><span style=\"color: #4dbdff;\">Frank ICSE Class 10 Physics Solutions Modern Physics Radioactivity<\/span><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong><span style=\"color: #4dbdff;\">PAGE NO-281:<\/span><\/strong><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 1<\/span><\/strong><br \/>\nAtom consists of three elementary particles, neutrons, protons and electrons. Neutron and protons form the central part of atom called nucleus where electrons revolve around this central part in orbits called electronic orbits.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 2<\/span><\/strong><br \/>\nNucleus is central part of an atom which consist of elementary particles protons and neutrons.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 3<\/span><\/strong><br \/>\n(i) Atomic number is the number of protons present in the nucleus. As number of protons is equal to the number of electrons so atomic number also gives the number of electrons in an atom.<br \/>\n(ii) Mass number is the sum of protons and neutrons present in the nucleus.<br \/>\n(iii) Atomic mass of element is the relative mass of its atom as compared to the mass of carbon atom taken as 12.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 4<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128752\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-4.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 4\" width=\"579\" height=\"197\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 5<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128778\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-30.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 30\" width=\"324\" height=\"34\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 6<\/span><\/strong><br \/>\nThe atoms of same elements having the same atomic number Z but different mass number A are called isotopes.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 7<\/span><\/strong><br \/>\nIsotopes have same chemical properties but have different physical properties.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 8<\/span><\/strong><br \/>\nThe atoms of different elements having same mass number but different atomic number are called isobars.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 9<\/span><\/strong><br \/>\nSimilarities:<br \/>\nBoth ?-radiations and X-rays affect photographic plate, both travel with the speed of light.<br \/>\nDissimilarities:<br \/>\n?-radiations areobtained in emissions from the radioactive substances due to energy change in the nucleus of their atoms and X- rays are obtained when highly energetic cathode rays are stopped by a heavy metal target of high melting point.<br \/>\n?-radiations have high penetration power but X-rays do not have have very high penetration power.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 10<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128753\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-5.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 5\" width=\"577\" height=\"135\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 11<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128754\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-6.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 6\" width=\"558\" height=\"108\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 12<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128755\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-7.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 7\" width=\"557\" height=\"165\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 13<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128756\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-8.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 8\" width=\"426\" height=\"114\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 14<\/span><\/strong><br \/>\nRadioactivity is the spontaneous random emission of particles from within the nucleus of atom. Radiations are emitted from nucleus of atom thus radioactivity is a nuclear phenomenon.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 15<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128757\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-9.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 9\" width=\"552\" height=\"56\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 16<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128758\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-10.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 10\" width=\"554\" height=\"111\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 17<\/span><\/strong><br \/>\n(i) Alpha particles are heavy in mass and are positively charged so they are deflected less by magnetic field and direction is upward which can be calculated by Fleming left hand rule.<br \/>\n(ii) Beta particles are negligible in mass so they are highly deflected by magnetic field and they are negatively charge particle so they are deflected in downward direction.<br \/>\n(iii) Gamma radiations have no mass and no charge so they are not deflected by magnetic field.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 18<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128759\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-11.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 11\" width=\"574\" height=\"434\" \/><br \/>\n<strong><span style=\"color: #4dbdff;\">PAGE NO-282:<\/span><\/strong><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 19<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128760\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-12.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 12\" width=\"570\" height=\"298\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 20<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128761\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-13.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 13\" width=\"463\" height=\"45\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 21<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128762\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-14.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 14\" width=\"427\" height=\"41\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 22<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128763\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-15.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 15\" width=\"587\" height=\"311\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 23<\/span><\/strong><br \/>\nArtificial radioactive substances can be produced by bombarding lighter nuclides withalpha particles, protons and neutron. The radioactive substances produces in this manner are called radioisotopes. Radioisotopes can be used as:<br \/>\n(i) Rays from Radium produce satisfactorily improvement in skin diseases.<br \/>\n(ii) Radioactive Sulphur S35 helps to study advantages and disadvantages of fungicides.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 24<\/span><\/strong><br \/>\nFollowing precautions should be taken while handling the radioactive substances.(i) The sources should only be handled by the forceps provided and never touched by hand.(ii) They should never be pointed towards a person.(iii) Food should not be taken where the sources are being used, as it may be contaminated.(iv) Never smoke near a radioactive source.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 25<\/span><\/strong><br \/>\nRadioactive substances should not be touched by hands because radiation emitted by radioactive substances can cause burns, Leukaemia, eye cataract, sterility or many other dangerous disease.<\/p>\n<h5><span class=\"ez-toc-section\" id=\"Frank_ICSE_Class_10_Physics_Solutions_Modern_Physics-3\"><\/span><strong><span style=\"color: #4dbdff;\">Frank ICSE Class 10 Physics Solutions Modern Physics<\/span><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><strong><span style=\"color: #4dbdff;\">PAGE NO-283:<\/span><\/strong><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 1<\/span><\/strong><br \/>\n(a) Mass number of copper = 63Atomic number of copper = 29As atomic number of element gives number of proton and electrons while mass number of element gives number of protons +number of neutrons.So, number of protons in copper = atomic number of copper = 29.Number of electron in copper = number of protons in copper =29.Number of neutrons = mass number ? atomic number = 63 ? 29 =34.So answer is<br \/>\n(iii) as copper contains 29 protons and 29 electrons.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128764\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-16.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 16\" width=\"543\" height=\"475\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128765\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-17.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 17\" width=\"529\" height=\"202\" \/><br \/>\n<strong><span style=\"color: #4dbdff;\">PAGE NO-284:<\/span><\/strong><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 2<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128766\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-18.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 18\" width=\"546\" height=\"165\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 3<\/span><\/strong><br \/>\n(a) Electron has<br \/>\n(ii) a mass less than that of a proton.<br \/>\n(b) Neutrons have<br \/>\n(iv) no electric charge.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 4<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128767\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-19.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 19\" width=\"584\" height=\"306\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 5<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128768\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-20.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 20\" width=\"486\" height=\"616\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 6<\/span><\/strong><br \/>\n(a)Mass number of uranium = 235Atomic number of uranium = 92As atomic number of element gives number of proton and electrons while mass number of element gives number of protons +number of neutrons.So, number of protons in uranium = atomic number of uranium = 92.(b) Number of electron in uranium = number of protons in uranium =92.(c)The atoms of same elements having the same atomic number Z but different mass number A are called isotopes. So, for another isotope of uranium mass number 235 changes.(d)Number of protons in isotopes is same and as U238 is isotope of <sub>92<\/sub>U<sup>235<\/sup>. So, number of protons in U<sup>235<\/sup> is also 92.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 7<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128769\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-21.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 21\" width=\"520\" height=\"263\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 8<\/span><\/strong><br \/>\nThe atoms of same elements having the same atomic number Z but different mass number a are called isotopes. Hydrogen have 3 isotopes protium <sub>1<\/sub>H<sup>1<\/sup>, deuterium <sub>1<\/sub>H<sup>2<\/sup>, tritium <sub>1<\/sub>H<sup>3<\/sup>.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 9<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128770\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-22.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 22\" width=\"596\" height=\"566\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 10<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128771\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-23.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 23\" width=\"605\" height=\"420\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 11<\/span><\/strong><br \/>\nFollowing precautions should be taken while handling the radioactive substances.<br \/>\n(i) The sources should only be handled by the forceps provided and never touched by hand.<br \/>\n(ii) They should never be pointed towards a person.<br \/>\n(iii) Food should not be taken where the sources are being used, as it may be contaminated.<br \/>\n(iv) Never smoke near a radioactive source<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 12<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128772\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-24.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 24\" width=\"488\" height=\"125\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 13<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128773\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-25.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 25\" width=\"359\" height=\"66\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 14<\/span><\/strong><br \/>\n(a) When certain metals are heated to a high temperature, they emit thermions (electrons) and the phenomenon is called thermionic emission.<br \/>\n(b) Thermionic emission of electrons from a heated surface depends upon:<br \/>\n(i) Work function of the material.<br \/>\n(ii) Melting point of the material.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 15<\/span><\/strong><br \/>\n(a)<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128774\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-26.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 26\" width=\"593\" height=\"193\" \/><br \/>\n(b) Uses of cathode ray tubes are:<br \/>\n(i) Cathode ray tubes are used in science research laboratories by scientist for converting electrical signals into visual signals and television tubes.<br \/>\n(ii) Cathode ray tubes are used by doctors for converting electrical impulses corresponding to heart beats into visual signals in ECG, EEG etc.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 16<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128777\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-29.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 29\" width=\"563\" height=\"102\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 17<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128775\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-27.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 27\" width=\"626\" height=\"406\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 18<\/span><\/strong><br \/>\nFollowing precautions should be taken while handling the radioactive substances.(i) The sources should only be handled by the forceps provided and never touched by hand.(ii) They should never be pointed towards a person.(iii) Food should not be taken where the sources are being used, as it may be contaminated.(iv) Never smoke near a radioactive source.<br \/>\n<strong><span style=\"color: #eb4924;\">Solution 19<\/span><\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-128776\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Frank-ICSE-Class-10-Physics-Solutions-Modern-Physics-28.png\" alt=\"Frank ICSE Class 10 Physics Solutions Modern Physics 28\" width=\"600\" height=\"371\" \/><br \/>\n<strong><span style=\"color: #eb4924;\">Solution 20<\/span><\/strong><br \/>\nThe low temperature microwave radiation that arrives at the earth\u2019s surface from all directions of outer space is called background radiation.Sources of background radiations are:<br \/>\n(a) Radiation from the sun.<br \/>\n(b) Rocks in the earth which contain traces of radioactive substances.<br \/>\n(c) Naturally occurring isotopes.<br \/>\n(d) Artificial radioisotopes.No, it is not possible to keep ourselves away from these radiations.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Frank ICSE Class 10 Physics Solutions Modern Physics &nbsp; Frank ICSE Class 10 Physics Solutions Modern Physics Frank ICSE Class 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