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Threshold frequency of a metal is 5xx10^...

Threshold frequency of a metal is `5xx10^(13)s^(-1)` upon which `1xx10^(14)s^(-1)` frequency light is focused. Then the maximum kinetic energy of emitted electron is-

A

` 3. 3 xx 10 ^( -21 ) J `

B

` 6.6 xx 10 ^( -21 ) J`

C

` 3.3 xx 10 ^( -20) J`

D

`6.6 xx 10^(-20) J `

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The correct Answer is:
C
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