A) \[3.3\times {{10}^{2}}\]
B) \[3.3\times {{10}^{3}}\]
C) \[3.3\times {{10}^{4}}\]
D) \[3.3\times {{10}^{5}}\]
Correct Answer: C
Solution :
Intensity, $l={{10}^{-10}}Wb{{m}^{-2}}={{10}^{-10}}J{{s}^{-1}}{{m}^{-2}}.$ Let the number of photons required be n. Then,$\frac{nhv}{{{10}^{-4}}}={{10}^{-10}}$ Hence, $n={{10}^{-10}}\times {{10}^{-4}}/hv={{10}^{-14}}\frac{\lambda }{hc}$ $=\frac{{{10}^{-14}}\times 660\times {{10}^{-9}}}{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}=3.3\times {{10}^{4}}$You need to login to perform this action.
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