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Photo-electric emission is observed from...

Photo-electric emission is observed from a metalli surface for frequenceis `f_(1)` and `f_(2)` of the incident light. `(f_(1)gtf_(2))` .If the maximum values of K.E. of photo-electrons emitted in two cases are in the ratio 1:n, then the threshold frequency of a metallic surface is .......

A

`(v_(1)-v_(2))/(k-1)`

B

`(kv_(1)-v_(2))/(k-1)`

C

`(kv_(2)-v_(1))/(k-1)`

D

`(v_(1)-v_(1))/(k)`

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The correct Answer is:
B
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