A) \[5\times {{10}^{15}}\]
B) \[5\times {{10}^{16}}\]
C) \[5\times {{10}^{17}}\]
D) \[5\times {{10}^{14}}\]
Correct Answer: A
Solution :
Key Idea: Photons are the packets of energy. Power emitted, \[P=2\times {{10}^{-3}}W\] Energy of photon, E = hv \[=6.6{{\times }^{-34}}\times 6\times {{10}^{14}}\,J\] h being Planck's constant. Number of photons emitted per second \[n=\frac{P}{E}\] \[=\frac{2\times {{10}^{-3}}}{6.6\times {{10}^{-34}}\times 6\times {{10}^{14}}}\] \[5\times {{10}^{15}}\]
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