1.

If the work function of a photometal is 6.825 eV. Its threshold wavelength will be \[(c=3\times {{10}^{8}}\,m/s)\] [Pb. PET 2000; BHU 2004]

A.            1200 Å                                     
B.            1800 Å
C.            2400 Å                                     
D.            3600 Å
Answer» C.            2400 Å                                     


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