1.

The ratio of the speed of the electrons in the ground state of hydrogen to the speed of light in vacuum isA. `1//2`B. `2/137`C. `1//137`D. `1//237`

Answer» Correct Answer - C
`v_(n)=(Ze^(2))/(ehepsi_(0))(1)/(n)`
The velocity of electron in the first orbit (n=1) of H-atom (Z-1) is
`" " v_(1)=(e^(2))/(2hepsi_(0))=(e)/(137)`
`:." " (v_(1))/(c)=(1)/(137)`


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