An electron in a Bohr orbit of hydrogen ...

An electron in a Bohr orbit of hydrogen atom with quantum number n has an angular momentum `4.2176xx10^(-34)kg-m^(2)//sec`.If the electron drops from this level to the next lower level , the wavelength of this lines is

`18.75 xx10^(-7)` m

`1.87 xx10^(-7)`m

`187.5 xx10^(-7)` m

`0.187 xx10^(-7)` m

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