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  4. Assertion :The threshold frequency of photoelectric effect supports the particle nature of light Reason: If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface

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Q. Assertion :The threshold frequency of photoelectric effect supports the particle nature of light
Reason: If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface

Dual Nature of Radiation and Matter

Solution:

There is no emission of photoelectrons till the frequency of incident light is less than a minimum frequency, however intense light it may be. In photoelectric effect, it is a single particle collision. Intensity is $h\upsilon\times N$, where $h\upsilon$ is the individual energy of the photon and $N$ is the total number of photon. In the wave theory, the intensity is proportional, not only to $\upsilon^{2}$ but also to the amplitude squared. For the same frequency, increase in intensity only increase the number of photons (in the quantum theory of Einstein).