An electromagnetic wave of wavelength ' ' is incident on a photosensitive surface of negligible work function. If ' m ' mass is of photoelectron emitted from the surface has de-Broglie wavelength ' d ', then

1. A. d= ( 2mc h ) 2
2. B. = ( 2mc h ) d 2
3. C. = ( 2h mc ) d 2
4. D. = ( 2m hc ) d 2

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