A) \[7.25\times {{10}^{6}}\]m/s
B) \[6.26\times {{10}^{6}}m/s\]
C) \[5.25\times {{10}^{6}}m/s\]
D) \[4.24\times {{10}^{6}}m/s\]
Correct Answer: A
Solution :
By using \[{{\lambda }_{electron}}=\frac{h}{{{m}_{e}}v}\] Þ \[v=\frac{h}{{{m}_{e}}{{\lambda }_{e}}}\] \[=\frac{6.6\times {{10}^{-34}}}{9.1\times {{10}^{-31}}\times {{10}^{-10}}}=7.25\times {{10}^{6}}m/s.\]
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