Question

why is photoelectric theory not suitable with low frequency light rays ?​

Answer 1

ANSWER:-

According to the classical wave theory of light, the intensity of the light determines the amplitude of the wave, and so a greater light intensity should cause the electrons on the metal to oscillate more violently and to be ejected with a greater kinetic energy.

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Answer 2

Now shine the light on a piece of metal. Trapped in the metal are many electrons, each of which requires a certain amount of energy to be freed. ... Let's shine a beam of light on the metal such that the frequency of the light is too low for electrons to be emitted, according to the theory above.