A) \[1.46\times {{10}^{6}}m/s\]
B) \[0.73\times {{10}^{6}}m/s\]
C) \[3.0\times {{10}^{8}}m/s\]
D) \[2.92\times {{10}^{6}}m/s\]
Correct Answer: A
Solution :
[a] Speed of electron in nth orbit \[{{V}_{n}}=\frac{2\pi KZ{{e}^{2}}}{nh}\] \[V=\left( 2.19\times {{10}^{6}}m/s \right)\frac{Z}{n}\] \[V=(2.19\times {{10}^{6}})\frac{2}{3}\left( Z=2\And n=3 \right)\] \[V=1.46\times {{10}^{6}}m/s\]
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