{"id":89641,"date":"2022-02-14T00:39:50","date_gmt":"2022-02-13T19:09:50","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=89641"},"modified":"2024-02-23T16:04:18","modified_gmt":"2024-02-23T10:34:18","slug":"to-study-effect-of-intensity-of-light-by-varying-distance-of-he-source-on-an-ldr","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-material\/physics\/to-study-effect-of-intensity-of-light-by-varying-distance-of-he-source-on-an-ldr\/","title":{"rendered":"To study effect of intensity of light (by varying distance of he source) on an LDR"},"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-material\/physics\/to-study-effect-of-intensity-of-light-by-varying-distance-of-he-source-on-an-ldr\/#To_study_effect_of_intensity_of_light_by_varying_distance_of_he_source_on_an_LDR\" title=\"To study effect of intensity of light (by varying distance of he source) on an LDR\">To study effect of intensity of light (by varying distance of he source) on an LDR<\/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-material\/physics\/to-study-effect-of-intensity-of-light-by-varying-distance-of-he-source-on-an-ldr\/#Viva_Voce\" title=\"Viva Voce\">Viva Voce<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"To_study_effect_of_intensity_of_light_by_varying_distance_of_he_source_on_an_LDR\"><\/span><span style=\"color: #00ccff\"><strong>To study effect of intensity of light (by varying distance of he source) on an LDR<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"color: #0000ff\"><strong>Aim<\/strong><\/span><br \/>\nTo study effect of intensity of light (by varying distance of the source) on an LDR.<\/p>\n<p><span style=\"color: #0000ff\"><strong>Apparatus<\/strong><\/span><br \/>\nLight source, light dependent resistors (L.D.R.s) of different variety, a multimeter (or meter bridge), a source of intense light (a lamp bulb with battery eliminator) and a convex lens.<br \/>\n<strong>Light Dependent Resistor<\/strong><br \/>\nThe light dependent resistance are the devices for detecting and measuring electromagnetic waves (light etc.). Its working is based upon the principle of variation of the photoconductivity when radiation is incident upon it and absorbed by it.<br \/>\nA light dependent resistor is prepared from cadmium sulphide. Its resistance depends upon the intensity and duration of light incident on it.<br \/>\nA good quality LDR shows a resistance variation from 1 M\u03a9 in complete darkness to about 10 \u03a9 in full day light. The intensity of light decreases inversely with increase the square of distance.<\/p>\n<p><span style=\"color: #0000ff\"><strong>Procedure<\/strong><\/span><\/p>\n<ol>\n<li>Turn the selector switch and set it on R for the measurement of resistance, in multimeter.<\/li>\n<li>Plug the metallic ends of black probe in terminal marked common in multimeter and that of red in terminal marked as P (or +). Short the other metallic ends and adjust the \u2018R adjusting\u2019 to get full scale deflection reading at zero ohm in the meter.<\/li>\n<li>Touch the metallic probes to the two metal ends of the L.D.R. [Fig. (a)] and read the value of resistance when (a) the source is kept at a distance of 2 cm, fixing the source of light in a stand and keeping the L.D.R. vertically below it.<br \/>\n(i) Moving the source to 4 cm distance from the L.D.R. and<br \/>\n(ii) Moving the source to 6,8 and 10 cm from L.D.R. and repeating observation three more times.<\/li>\n<\/ol>\n<p><span style=\"color: #0000ff\"><strong>Observation record<\/strong><\/span><br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2022\/02\/30580899903_bba2a551cb_o.png\" alt=\"to-study-effect-of-intensity-of-light-by-varying-distance-of-he-source-on-an-ldr-2\" width=\"769\" height=\"246\" \/><\/p>\n<p><span style=\"color: #0000ff\"><strong>Conclusion<\/strong><\/span><br \/>\nWhen the distance between light source and L.D.R. increases the resistance of L.D.R. decreases.<br \/>\n<strong>Note:<\/strong> Same activity can be done by varying the exposure time in steps for same source of light, same LDR and for same distance.<\/p>\n<p><span style=\"color: #0000ff\"><strong>Precautions<\/strong><\/span><\/p>\n<ol>\n<li>No stray light should fall on the L.D.R. It is better to work in a dark room.<\/li>\n<li>Connect L.D.R. carefully to the voltage source.<\/li>\n<\/ol>\n<h3 style=\"text-align: center\"><span class=\"ez-toc-section\" id=\"Viva_Voce\"><\/span><span style=\"color: #0000ff\"><strong>Viva Voce<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Question. 1. Mention names of three basic logic gates.<\/strong><br \/>\n<strong> Answer.<\/strong> (i) OR gate, (ii) AND gate, (iii) NOT gate.<\/p>\n<p><strong>Question. 2. What do you mean by logic gate in electronics?<\/strong><br \/>\n<strong> Answer.<\/strong> The circuit which is used to perform the switching action is called a logic gate.<\/p>\n<p><strong>Question.3. What are n-p-n and p-n-p transistors?<\/strong><br \/>\n<strong> Answer.<\/strong> An npn transistor consists of a thin p-type layer sandwitched between two thick n-type layers. A p-n-p transistor consists of a thin n-type layer sandwitched between two thick n-type layers.<\/p>\n<p><strong>Question. 4. In a transistor, base is made thin and is doped very lightly. Why?<\/strong><br \/>\n<strong> Answer.<\/strong> Base is made very thin and is doped lightly so that most of the carriers are attracted straight into the collector and very few combine in the base. Therefore, to reduce the I<sub>b<\/sub> and to increase I<sub>c<\/sub> .<\/p>\n<p><strong>Question. 5. When does a diode work as an open switch?<\/strong><br \/>\n<strong> Answer.<\/strong> In reverse bias, a diode works as an open switch.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To study effect of intensity of light (by varying distance of he source) on an LDR Aim To study effect [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"\"Get To study effect of intensity of light (by varying distance of he source) on an LDR on Infinity Learn.\"","custom_permalink":"study-material\/physics\/to-study-effect-of-intensity-of-light-by-varying-distance-of-he-source-on-an-ldr\/"},"categories":[4,21],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>To study effect of intensity of light (by varying distance of he source) on an LDR - 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