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Photons of wavelength lambda are inciden...

Photons of wavelength `lambda` are incident on a metal. The most energies electrons ejected from the metal are bent into a circular arc of radius R by a perpendicular magnetic field having magnitude B. The work function of the metal is

A

`( hc)/( lambda)- m_(e) + ( e^(2) B^(2) R^(2))/(2m_(e ))`

B

`(hc)/( lambda) + 2m_(e ) [ ( eBR)/(2m_(e ))]^(2)`

C

`(hc)/(lambda) - m_(e ) c^(2) - ( e^(2) B^(2) R^(2))/( 2m_(e ))`

D

`( hc)/( lambda) - 2m_(e ) [ ( eBR)/( 2m_(e ))]^(2)`

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The correct Answer is:
D
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