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The angular momentum of electron in a ...

The angular momentum of electron in a Bohr's orbit of H atom is `4.2178 xx 10^(-34) kg m^(2)s^(-1)`. Calculate the wavelength of the spectral line when the electrton falls from this level to the next lower level.

A

`1.8 xx 10^(-4)` cm

B

`3.9 xx10^(-5)` cm

C

`8.8 xx 10^(-2)` cm

D

`4.7 xx 10^(-3)` cm

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The correct Answer is:
A
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