A) \[2\text{ }{AA}\]
B) \[4{AA}\]
C) \[8{AA}~\]
D) \[100\text{ }{AA}\]
Correct Answer: B
Solution :
According to de?Broglie \[\lambda =\frac{h}{mv}=\frac{6.62\times {{10}^{-20}}erg.\,\sec }{\frac{2}{6.023\times {{10}^{23}}}\times 5\times {{10}^{4}}cm/\sec }\] \[=\frac{6.62\times {{10}^{-27}}\times 6.023\,\,\times {{10}^{23}}}{2\,\,\times 5\,\,\times {{10}^{4}}}cm\]\[=4\,\,\times {{10}^{-8}}cm=4\text{{ }\!\!\mathrm{\AA}\!\!\text{ }}\].
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