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The ratio of the speed of an electron in...

The ratio of the speed of an electron in the first orbit of hydrogen atom to that in the first orbit of He is

A

`e^2/(2epsilon_0hc)`

B

`2eepsilon_0/hc`

C

`e^3/(2epsilon_0hc)`

D

`2epsilon_0e^2/hc`

Text Solution

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The correct Answer is:
A
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