1.

Light of wavelength 4000 Å falls on a photosensitive metal and a negative 2V potential stops the emitted electrons. The work function of the material (in eV) is approximately            \[(h=6.6\times {{10}^{-34}}Js,\ \ e=1.6\times {{10}^{-19}}C,\ \ c=3\times {{10}^{8}}m{{s}^{-1}})\]  [MP PMT 1995; MH CET 2004]

A.            1.1 
B.            2.0
C.            2.2 
D.            3.1
Answer» B.            2.0


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