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Work function of a metal is minimum energy required to

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Important Questions on Electrons and Photons

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Classical Thinking>Q 52
The photoelectric threshold frequency of a metal is v0. When light of frequency 3v0 is incident on the metal, the maximum kinetic energy of emitted photoelectrons will be
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Classical Thinking>Q 53

Assertion: Photoelectric effect supports the quantum nature of light.

Reason: Electric charge of photoelectrons is quantised.

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Critical Thinking>Q 1
If the work function of a metal is ' ϕ ' and the frequency of the incident light is v, there is no emission of photoelectron if
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Critical Thinking>Q 2
The retarding potential for having zero photoelectron current
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Critical Thinking>Q 3
Light of frequency 1.5 times the threshold frequency is incident on photosensitive material. If frequency is halved and intensity doubled, then the photocurrent is
 
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Critical Thinking>Q 5
Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Critical Thinking>Q 6
In photoelectric emission, the velocity of electrons ejected from near the surface is
 
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MHT-CET
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Competitive Thinking>Q 8
The threshold wavelength for lithium is 5250 A∘. For photoemission to take place, the wavelength of the incident light must be