A) \[1.5\times {{10}^{16}}\]
B) \[2.5\times {{10}^{16}}\]
C) \[4.5\times {{10}^{16}}\]
D) \[8.5\times {{10}^{16}}\]
Correct Answer: A
Solution :
Power = Energy emitted per unit time \[=3\times {{10}^{-3}}\,J/s\] \[\Rightarrow \] Energy of one photon = hv \[=6.64\times {{10}^{-34}}\times 3\times {{10}^{14}}\] \[\Rightarrow \] So number of photons emitted per second \[=\frac{3\times {{10}^{-3}}}{6.64\times {{10}^{-34}}\times 3\times {{10}^{14}}}\] \[=\frac{1}{6.64}\times {{10}^{17}}\] \[=0.15\times {{10}^{17}}\] \[=1.5\times {{10}^{16}}\]
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