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Q.

Photoelectric effect supports quantum nature of light because

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a

even when the metal surface is faintly illuminated with light of appropriate λ the photoelectrons leave the surface immediately

b

electric charge of the photoelectrons is quantized

c

there is a minimum frequency below which no photoelectrons are emitted

d

the maximum kinetic energy photoelectrons depends only on the frequency of light and not on its intensity

answer is A, B, C.

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