A) \[7.169\times {{10}^{19}}\]
B) \[4.569\times {{10}^{19}}\]
C) \[8.579\times {{10}^{19}}\]
D) \[9.662\times {{10}^{19}}\]
Correct Answer: A
Solution :
25 watt\[=25\text{ }J{{s}^{-1}}\] \[E=NHv=\frac{Nhc}{\lambda }\] \[25=\frac{N\times 6.626\times {{10}^{-34}}\times 3\times {{10}^{8}}}{0.57\times {{10}^{-6}}}\] \[N=7.169\times {{10}^{19}}quanta\text{ }{{s}^{-1}}\]
You need to login to perform this action.
You will be redirected in
3 sec
