A) \[1.25\times {{10}^{8}}m/s\]
B) \[1.25\times {{10}^{6}}m/s\]
C) \[2.5\times {{10}^{8}}m/s\]
D) \[2.5\times {{10}^{7}}m/s\]
Correct Answer: B
Solution :
speed of electron in nth orbit \[=\frac{e}{137}\times \frac{Z}{n}\] So speed of electron in second orbit \[=\frac{3\times {{10}^{8}}}{137}\times \frac{1}{2}\] \[=1.25\times {{10}^{6}}m/s\]
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