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Grade: 11 

                        
The angular momentum of an electron in Bohr’s orbit of He+ is 3.1652*10^-34 kgm^2/sec. what is wave number in terms of rydbergs constant (R) of the spectral line emitted if an electron falls from this level to first excited state ( using h=6.626*10^-34 Joule second. )
2 years ago

Answers : (1)

Eshan
askIITians Faculty
2095 Points 
							Dear student,

Angular momentum in Bohr’s orbit is quantized and is equal to

\dfrac{nh}{2\pi}=3.1652\times 10^{-34}
\implies n=3

The electrons falls from this level to first excited state, that is, n=2.
Hence the wave number of emitted line=R(\dfrac{1}{2^2}-\dfrac{1}{3^2})=\dfrac{5R}{36}
2 years ago
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