1.

If in hydrogen atom, radius of \[{{n}^{th}}\] Bohr orbit is \[{{r}_{n}},\] frequency of revolution of electron in \[{{n}^{th}}\] orbit is \[{{f}_{n}}\] choose the correct option 

A.                                   
B.                 
C.                         
D.            Both (a) and (b)
Answer» E.


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