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A photosensitive material would emit electrons when excited by photons beyond a threshold energy. To cross the threshold, one should increase

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Wavelength of light

Frequency of light

Intensity of light

Voltage applied to the light source

answer is B.

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Detailed Solution

According to the particle nature of light, the energy of the photon only depend on the frequency.

In order to emit electrons when excited by photons beyond a threshold hold energy, one should increase frequency of light.

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