A) 140 Å
B) 0.14 Å
C) 14 Å
D) 1.4 Å
Correct Answer: D
Solution :
\[\lambda =\frac{h}{\sqrt{2mE}}=\frac{6.6\times {{10}^{-34}}}{\sqrt{2\times 9\times {{10}^{-31}}\times 80\times 1.6\times {{10}^{-19}}}}\]\[=1.4{\AA}\]
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