{"id":87589,"date":"2025-06-01T06:48:18","date_gmt":"2025-06-01T06:48:18","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87589"},"modified":"2025-06-01T06:48:18","modified_gmt":"2025-06-01T06:48:18","slug":"which-one-of-the-following-metals-is-used-in-the-filaments-of-photo-el","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-metals-is-used-in-the-filaments-of-photo-el\/","title":{"rendered":"Which one of the following metals is used in the filaments of photo-el"},"content":{"rendered":"

Which one of the following metals is used in the filaments of photo-electric cells that convert light energy into electric energy ?<\/p>\n

[amp_mcq option1=”Tungsten” option2=”Copper” option3=”Rubidium” option4=”Aluminium” correct=”option3″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC NDA-1 – 2018<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nPhoto-electric cells, which convert light energy into electrical energy via the photoelectric effect, utilize materials with low work functions. Alkali metals are known for their low work functions, meaning they easily emit electrons when illuminated by light of sufficient frequency. Among the given options, Rubidium is an alkali metal and is used in photoemissive surfaces in some types of photocells or photomultiplier tubes. Caesium is also very commonly used, often alloyed with other elements.
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\nAlkali metals have low work functions, making them suitable for use as photoemissive materials in devices that rely on the photoelectric effect.
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\nTungsten is a refractory metal with a high melting point and is used as a filament in incandescent bulbs, but it has a high work function. Copper and Aluminium are conductors but are not typically used as primary photoemissive surfaces for converting light to electricity in this manner. Photocathodes in modern photomultiplier tubes often use complex alloys or semiconductor materials for optimized sensitivity to different wavelengths of light.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following metals is used in the filaments of photo-electric cells that convert light energy into electric energy ? [amp_mcq option1=”Tungsten” option2=”Copper” option3=”Rubidium” option4=”Aluminium” correct=”option3″] This question was previously asked in UPSC NDA-1 – 2018 Download PDFAttempt Online Photo-electric cells, which convert light energy into electrical energy via the photoelectric effect, utilize … <\/p>\n

Detailed SolutionWhich one of the following metals is used in the filaments of photo-el<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1093],"tags":[1114,1160,1128],"class_list":["post-87589","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1114","tag-physical-properties-of-materials","tag-physics","no-featured-image-padding"],"yoast_head":"\nWhich one of the following metals is used in the filaments of photo-el<\/title>\n<meta name=\"description\" content=\"Photo-electric cells, which convert light energy into electrical energy via the photoelectric effect, utilize materials with low work functions. Alkali metals are known for their low work functions, meaning they easily emit electrons when illuminated by light of sufficient frequency. Among the given options, Rubidium is an alkali metal and is used in photoemissive surfaces in some types of photocells or photomultiplier tubes. Caesium is also very commonly used, often alloyed with other elements. Alkali metals have low work functions, making them suitable for use as photoemissive materials in devices that rely on the photoelectric effect.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-metals-is-used-in-the-filaments-of-photo-el\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following metals is used in the filaments of photo-el\" \/>\n<meta property=\"og:description\" content=\"Photo-electric cells, which convert light energy into electrical energy via the photoelectric effect, utilize materials with low work functions. Alkali metals are known for their low work functions, meaning they easily emit electrons when illuminated by light of sufficient frequency. Among the given options, Rubidium is an alkali metal and is used in photoemissive surfaces in some types of photocells or photomultiplier tubes. Caesium is also very commonly used, often alloyed with other elements. Alkali metals have low work functions, making them suitable for use as photoemissive materials in devices that rely on the photoelectric effect.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-metals-is-used-in-the-filaments-of-photo-el\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T06:48:18+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following metals is used in the filaments of photo-el","description":"Photo-electric cells, which convert light energy into electrical energy via the photoelectric effect, utilize materials with low work functions. 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Among the given options, Rubidium is an alkali metal and is used in photoemissive surfaces in some types of photocells or photomultiplier tubes. Caesium is also very commonly used, often alloyed with other elements. 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