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The energy of gamma ( γ ) ray photon is Eγ and that of an X-ray photon is Ex. If the visible light photon has energy of Ev , then we can say that 
 

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Important Questions on Electrons and Photons

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MHT-CET
IMPORTANT
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 22
According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is 
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MHT-CET
IMPORTANT
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 23
Light of wavelength λ  which is less than threshold wavelength is incident on a photosensitive material. If incident wavelength is decreased then stopping potential will
 
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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 24
In a photocell, frequency of incident radiation is increased by keeping other factors constant v>v0, the stopping potential 
 
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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 25
Following graphs shows the variation of stopping potential corresponding to the frequency of incident radiation (F) for a given metal. The correct variation is shown in the graph v0=Threshold frequency)                                                                                                                                                            Question Image
HARD
MHT-CET
IMPORTANT
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 26
The radiation of wavelength 332 nm is incident on metal of work function 1.07eV. The value of the stopping potential will be
 
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MHT-CET
IMPORTANT
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 27
The work function of a metal is 4.2 eV. Its threshold wavelength will be 
 
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MHT-CET
IMPORTANT
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 28
Ultraviolet radiations of 6.2 eV falls on an aluminium surface (work function 4.2 eV). The kinetic energy in joules of the fastest electron emitted is approximately 
 
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MHT-CET
IMPORTANT
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 29
When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5eVto 0.8eV. The work function of the metal is