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In photoelectric effect, the electrons are not emitted by  photosensitive material unless

Option: 1

Velocity of incident light exceeds a certain minimum velocity


Option: 2

The frequency of incident light exceeds a certain minimum frequency 


Option: 3

The wavelength of incident light exceeds a certain minimum wavelength 

 


Option: 4

The intensity of incident light exceeds a certain minimum intensity


Answers (1)

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As soon as the frequency of incident light exceeds the threshold frequency, the emission starts immediately without any apparent time lag. The experimental results instead show that electrons are dislodged only when the light exceeds a certain frequency. If the frequency of light is more than the threshold frequency, kinetic energy is released with ejecting the electron. If the light frequency is lower than the threshold frequency, no electron is ejected and no kinetic energy is produced. greater the frequency of the incident light, the greater is the stopping potential. The greater the energy of photons is, the smaller is the stopping potential. The greater the intensity of light is, the greater is the cut-off frequency. greater the frequency of incident light is, the greater is max kinetic energy of ejected electrons.

Therefore, the correct answer is B) The frequency of incident light exceeds a certain minimum frequency

 

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jitender.kumar

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