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A photon of wavelength 4 xx 10^(-7)m str...

A photon of wavelength `4 xx 10^(-7)m` strikes on metal surface, The work function of the metal is `2.13eV`. The velocity of the photo electron is

A

`5.67 xx 10^(6) ms^(-1)`

B

`5.67 xx 10^(5) ms^(-1)`

C

`5.67 xx 10^(-5) ms^(-1)`

D

`5.67 xx 10^(-6) ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`hv = W + (1)/(2) mv^2, (h C)/(lambda) = W + (1)/(2) mv^2`
`(because 1eV = 1.6xx 10^(-19) J ) W =2.13 xx 1.6 xx 10^(-19)` J
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