{"id":333944,"date":"2023-01-06T02:49:55","date_gmt":"2023-01-05T21:19:55","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/question\/in-a-photoelectric-set-up-a-point-source-of-light-of-power-3-2x10-3w-emits-monoenergetic-photons-of-energy-5-0-ev-the-source-is-located-at-a-distance-of-0-8m-from-the-centre-of-a-stat\/"},"modified":"2025-06-30T10:57:33","modified_gmt":"2025-06-30T05:27:33","slug":"in-a-photoelectric-set-up-a-point-source-of-light-of-power-3-2x10-3w-emits-monoenergetic-photons-of-energy-5-0-ev-the-source-is-located-at-a-distance-of-0-8m-from-the-centre-of-a-stat","status":"publish","type":"questions","link":"https:\/\/infinitylearn.com\/surge\/question\/physics\/in-a-photoelectric-set-up-a-point-source-of-light-of-power\/","title":{"rendered":"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source."},"content":{"rendered":"","protected":false},"author":1,"template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source.","custom_permalink":"question\/physics\/in-a-photoelectric-set-up-a-point-source-of-light-of-power\/"},"categories":[],"acf":{"question":"<p>In a photoelectric set-up, a point source of light (of power 3.2<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mo>\u00d7<\/mo><\/math>10<sup>\u20133<\/sup>W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mo>\u00d7<\/mo><\/math>10<sup>\u20133<\/sup> m. The efficiency of photoelectric emission by the metallic sphere is one for every 10<sup>6<\/sup> photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source&nbsp;of light per second to be&nbsp;<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mi mathvariant=\"normal\">E<\/mi><mo>=<\/mo><mfrac><msup><mi>Pr<\/mi><mn>2<\/mn><\/msup><mrow><mn>4<\/mn><msup><mi mathvariant=\"normal\">R<\/mi><mn>2<\/mn><\/msup><\/mrow><\/mfrac><\/math>, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source.<\/p>","options":null,"solution":"","subject":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source. - Infinity Learn by Sri Chaitanya<\/title>\n<meta name=\"description\" content=\"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/infinitylearn.com\/surge\/question\/physics\/in-a-photoelectric-set-up-a-point-source-of-light-of-power\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source. - Infinity Learn by Sri Chaitanya\" \/>\n<meta property=\"og:description\" content=\"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/infinitylearn.com\/surge\/question\/physics\/in-a-photoelectric-set-up-a-point-source-of-light-of-power\/\" \/>\n<meta property=\"og:site_name\" content=\"Infinity Learn by Sri Chaitanya\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/InfinityLearn.SriChaitanya\/\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-30T05:27:33+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2025\/04\/infinitylearn.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1008\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@InfinityLearn_\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source. - Infinity Learn by Sri Chaitanya","description":"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/infinitylearn.com\/surge\/question\/physics\/in-a-photoelectric-set-up-a-point-source-of-light-of-power\/","og_locale":"en_US","og_type":"article","og_title":"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source. - Infinity Learn by Sri Chaitanya","og_description":"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source.","og_url":"https:\/\/infinitylearn.com\/surge\/question\/physics\/in-a-photoelectric-set-up-a-point-source-of-light-of-power\/","og_site_name":"Infinity Learn by Sri Chaitanya","article_publisher":"https:\/\/www.facebook.com\/InfinityLearn.SriChaitanya\/","article_modified_time":"2025-06-30T05:27:33+00:00","og_image":[{"width":1920,"height":1008,"url":"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2025\/04\/infinitylearn.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_site":"@InfinityLearn_","schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Organization","@id":"https:\/\/infinitylearn.com\/surge\/#organization","name":"Infinity Learn","url":"https:\/\/infinitylearn.com\/surge\/","sameAs":["https:\/\/www.facebook.com\/InfinityLearn.SriChaitanya\/","https:\/\/www.instagram.com\/infinitylearn_by_srichaitanya\/","https:\/\/www.linkedin.com\/company\/infinity-learn-by-sri-chaitanya\/","https:\/\/www.youtube.com\/c\/InfinityLearnEdu","https:\/\/twitter.com\/InfinityLearn_"],"logo":{"@type":"ImageObject","@id":"https:\/\/infinitylearn.com\/surge\/#logo","inLanguage":"en-US","url":"","contentUrl":"","caption":"Infinity Learn"},"image":{"@id":"https:\/\/infinitylearn.com\/surge\/#logo"}},{"@type":"WebSite","@id":"https:\/\/infinitylearn.com\/surge\/#website","url":"https:\/\/infinitylearn.com\/surge\/","name":"Infinity Learn by Sri Chaitanya","description":"Surge","publisher":{"@id":"https:\/\/infinitylearn.com\/surge\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/infinitylearn.com\/surge\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/infinitylearn.com\/surge\/question\/physics\/in-a-photoelectric-set-up-a-point-source-of-light-of-power\/#webpage","url":"https:\/\/infinitylearn.com\/surge\/question\/physics\/in-a-photoelectric-set-up-a-point-source-of-light-of-power\/","name":"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source. - Infinity Learn by Sri Chaitanya","isPartOf":{"@id":"https:\/\/infinitylearn.com\/surge\/#website"},"datePublished":"2023-01-05T21:19:55+00:00","dateModified":"2025-06-30T05:27:33+00:00","description":"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source.","breadcrumb":{"@id":"https:\/\/infinitylearn.com\/surge\/question\/physics\/in-a-photoelectric-set-up-a-point-source-of-light-of-power\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/infinitylearn.com\/surge\/question\/physics\/in-a-photoelectric-set-up-a-point-source-of-light-of-power\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/infinitylearn.com\/surge\/question\/physics\/in-a-photoelectric-set-up-a-point-source-of-light-of-power\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/infinitylearn.com\/surge\/"},{"@type":"ListItem","position":2,"name":"In a photoelectric set-up, a point source of light (of power 3.2\u00d710\u20133W) emits monoenergetic photons of energy 5.0 eV. The source is located at a distance of 0.8m from the centre of a stationary metallic sphere of work function 3.0 eV and of radius 8.0\u00d710\u20133 m. The efficiency of photoelectric emission by the metallic sphere is one for every 106 photons incident on it. Assume that the sphere is isolated and initially neutral, and the photo electrons emitted by it are instantly swept away. As a result of it, the sphere gets positively charged and acquires a positive potential and after a certain time the photoelectron emission from it stops. Take the energy reaching the sphere from the source\u00a0of light per second to be\u00a0E=Pr24R2, where r is the radius of the sphere, R is the distance between the point source and the centre of the sphere and P is the power of the source."}]}]}},"_links":{"self":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/questions\/333944"}],"collection":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/questions"}],"about":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/types\/questions"}],"author":[{"embeddable":true,"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/users\/1"}],"wp:attachment":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/media?parent=333944"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/categories?post=333944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}