The angular momentum of an electron in a...

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

`1.8 xx 10^(-4)` cm

`3.9 xx10^(-5)` cm

`8.8 xx 10^(-2)` cm

`4.7 xx 10^(-3)` cm

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