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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