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Q.

Photo electric emission is observed from a metallic surface for frequencies   and  of the incident light rays (  ). If the maximum values of kinetic energy of the photo elections emitted in the two cases are in the ratio of 1:K, then the threshold frequency of the metallic surface is

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a

b

c

d

answer is B.

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Photo electric emission is observed from a metallic surface for frequencies   and  of the incident light rays (  ). If the maximum values of kinetic energy of the photo elections emitted in the two cases are in the ratio of 1:K, then the threshold frequency of the metallic surface is