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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