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(B) The threshold frequency ($ 
u_0 $) is defined as the minimum frequency of incident radiation required to eject photoelectrons from a metal surfac

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Material of the photosensitive surface

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(B) The threshold frequency ($ 
u_0 $) is defined as the minimum frequency of incident radiation required to eject photoelectrons from a metal surface.It is a characteristic property of the material of the photosensitive surface.It depends on the work function ($ \Phi_0 $) of the metal, which is given by the relation $ \Phi_0 = h 
u_0 $, where $ h $ is Planck's constant.Since the work function is specific to the nature of the material, the threshold frequency depends only on the material of the surface and is independent of the intensity or frequency of the incident light.

The value of threshold frequency depends on which of the following factors?

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