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An electromagnetic radiation of frequenc...

An electromagnetic radiation of frequency `3 xx 10^(15)` cycles per second falls on a photo electric whose work function is 4.0eV. Find out the maximum velocity of the photo electrons emitted by the surface.

A

`13.4 xx 10^(-19) m//s`

B

`19.8 xx 10^(-19)m//s`

C

`1.72 xx 10^(6)m//s`

D

None of these

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