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

`3.3xx10^(-21)J`

`6.6xx10^(-21)J`

`3.3xx10^(-20)J`

`6.6xx10^(-20)J`

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