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An electron in a Bohr orbit of hydrogen ...

An electron in a Bohr orbit of hydrogen atom with the quantum number `N_(2)` has an angular momentum `4.2176 xx 10^(-34) kg m^(2) s^(-1)`. If the electron drops from this level to the next lower level , the wavelength of this lines is

A

`18.75 xx10^(-7)` m

B

`1.87 xx10^(-7)`m

C

`187.5 xx10^(-7)` m

D

`0.187 xx10^(-7)` m

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The correct Answer is:
A
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