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A Cs plate is irradiated with a light of...


A Cs plate is irradiated with a light of wavelength `lamda=(hc)/(phi)`,`phi` being the work function of the plate, h Plank's constant, and c the velocity of light in vacuum. Assume all the photoelectron are moving perpendicular to the plate toward a YDSE setup when accelerated through a potential difference V. Take charge on a proton `=e` and moss of an electron `=m`. Read the paragraph carefully and answer the following question:The fringe width due to the electron beam is

A

`(lambdaD)/(d)`

B

`(lambdaD)/(2d)`

C

`(hD)/(dsqrt(2emV))`

D

none of these

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