1.

If mean wavelength of light radiated by 100 W lamp is 5000 Å, then number of photons radiated per second are [RPET 1997]

A.            \[3\times {{10}^{23}}\]    
B.            \[2.5\times {{10}^{22}}\]
C.            \[2.5\times {{10}^{20}}\]
D.            \[5\times {{10}^{17}}\]
Answer» D.            \[5\times {{10}^{17}}\]


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