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A photon sensitive metallic surface emit...

A photon sensitive metallic surface emits electrons when X-rays of wavelength `lambda` fal on it. The de-Broglie wavelength of the emitted electrons is (Neglect the work function of the surface, m is mass of the electron. H=Planck's constant. C= velocity of light)

A

`sqrt((2mc)/(h lambda))`

B

`sqrt((hlambda)/(2mc))`

C

`sqrt((mc)/(hlambda))`

D

`sqrt((hlambda)/(mc))`

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The correct Answer is:
B
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