An electron revolves in first orbit in H atom, then :

Options

A. Current associated due to orbital motion of electron is 1.06 m A.
B. Magnetic field at the centre of nucleus due to orbital motion of electron is 12.5 Tesla.
C. First excitation energy of H atom is 10.2 eV.
D. Current associated due to orbital motion of electron is 2.06 m A.

Explanation

`I=(1.96 z^(2))/(n^(3)) mA`
For H atom z=1 and first orbit n=1
I=1.06 mA. So choice (a) is correct
Magnetic field `B=(12.5Z^(3))/(n^(5))` Tesla
B=12.5 Tesla. So, choice (b) is correct ltbr `DeltaE=13.6 z^(2)[1-1/4]`
`=13.6xx3/4 =10.2 eV`. so, choice (c) id correct.