Q88 / 120 · VITEEE 2007 · Physics

A photo-sensitive material would emit electrons if excited by photons beyond a threshold. To overcome the threshold, one would increase

A
the voltage applied to the light source
B
the intensity of light
C
the wavelength of light
Correct answer
D
the frequency of light

Solution

By Einstein's equation, photoemission occurs when $h v>\phi_{0}$ or $h v>h v_{0}$ i.e., frequency of incident photon is greater than threshold frequency.

Hence, the correct answer is option: 'D'.

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