1.

The work function of a metallic surface is 5.01 eV. The photo-electrons are emitted when light of wavelength 2000Å falls on it. The potential difference applied to stop the fastest photo-electrons is  \[[h=4.14\times {{10}^{-15}}\ eV\sec ]\] [MP PET 1991; DPMT 1999]

A.            1.2 volts                                 
B.            2.24 volts
C.            3.6 volts                                 
D.            4.8 volts
Answer» B.            2.24 volts


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