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Light of frequency 7.21xx10^(14)Hz is in...

Light of frequency `7.21xx10^(14)Hz` is incident on a metal surface. Electrons with a maximum speed of `6.0xx10^(5)ms^(-1)` are ejected from the surface. What is the threshold frequency for photoemission of electrons? `h=6.63xx10^(-34)Js, m_(e)=9.1xx10^(-31)kg`.

A

`2 xx 10^(12)Hz`

B

`2 xx 10^(14)Hz`

C

`5 xx 10^(12)Hz`

D

`5 xx 10^(14)Hz`

Text Solution

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The correct Answer is:
D
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