A) \[1.4\times {{10}^{19}}\]
B) \[3.2\times {{10}^{17}}\]
C) \[3.4\times {{10}^{19}}\]
D) \[4.9\times {{10}^{-15}}\]
Correct Answer: A
Solution :
The energy radiation as visible light \[=\frac{5}{100}\times 100=5\,\text{J/s}\] Let a be the number of photons emitted per second. Then,\[nhv=n\frac{hc}{\lambda }=5\] \[\therefore \]\[n=\frac{5\lambda }{hc}\] \[=\frac{5\times 5.6\times {{10}^{-7}}}{(6.2\times {{10}^{-34}})(3\times {{10}^{8}})}=1.4\times {{10}^{19}}\]
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