1.

The radius of hydrogen atom in its ground state is \[5.3\times {{10}^{-11}}m\]. After collision with an electron it is found to have a radius of \[21.2\times {{10}^{-11}}m\]. What is the principal quantum number n of the final state of the atom [CBSE PMT 1994; CPMT 2001; MH CET 2000]

A.            n = 4       
B.            n = 2
C.            n = 16     
D.            n = 3
Answer» C.            n = 16     


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