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If a metal is irradiated with light of f...

If a metal is irradiated with light of frequency `3 xx 10^(19) sec^(-1)`, electron is emitted with kinetic energy of `6.625 xx 10^(-15)J`. The threshold frequency of the metal is

A

`2 xx 10^(19) sec^(-1)`

B

`1.25 xx 10^(19) sec^(-1)`

C

`6.625 xx 10^(35) sec^(-1)`

D

`6.625 xx 10^(19) sec^(-1)`

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The correct Answer is:
A
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