1.

Threshold wavelength for photoelectric effect on sodium is 5000 Å. Its work function is [CBSE PMT 1993]

A.            15 J
B.            \[16\times {{10}^{-14}}J\]
C.            \[4\times {{10}^{-19}}J\] 
D.            \[4\times {{10}^{-81}}J\]
Answer» D.            \[4\times {{10}^{-81}}J\]


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