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

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The voltage applied to the light source

The wavelength of light

The intensity of light

The frequency of light

answer is D.

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Detailed Solution

Photo emission depends on energy of the potons which is dependent on the frequency or wavelength of the light.

$E = h ν = \frac{h c}{λ}$

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