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

Light of frequency `7.21xx10^(14)` Hz is incident on a metal surface .Electrons with a maximum speed of `6.0xx10^(5)m//s` are ejected from the surface .What is the threshold frequency for photoemission of electrons?

A

`2.47xx10^(14)Hz`

B

`9.68xx10^(14)Hz`

C

`2.27xx10^(14)Hz`

D

`4.74xx10^(14)Hz`

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The correct Answer is:
D
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