A) \[2.9\times {{10}^{-9}}m\]
B) \[1.6\times {{10}^{-8}}m\]
C) \[6.5\times {{10}^{-7}}m\]
D) \[9.1\times {{10}^{-5}}m\]
Correct Answer: C
Solution :
The given, \[E=1.9\,eV\] We know that, \[E=\frac{hc}{\lambda }\] \[\lambda =\frac{hc}{E}\] \[=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{1.9\times 1.6\times {{10}^{-19}}}\] \[=\frac{19.8\times {{10}^{-7}}}{3.04}=6.5\times {{10}^{-7}}m\]
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