1.

The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100W is (taking h = \[6\times {{10}^{-34}}\,J\text{-}sec\]) [Kerala (Engg.) 2002; Pb. PET 2001]

A.            100
B.            1000
C.            \[3\times {{10}^{20}}\]    
D.            \[3\times {{10}^{18}}\]
Answer» D.            \[3\times {{10}^{18}}\]


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