1.

The energy required to excite an electron from the ground state of hydrogen atom to the first excited state, is [Pb. PMT 1999]

A.            \[1.602\times {{10}^{-14}}\,J\]        
B.            \[1.619\times {{10}^{-16}}\,J\]
C.            \[1.632\times {{10}^{-18}}J\]
D.            \[1.656\times {{10}^{-20}}J\]
Answer» D.            \[1.656\times {{10}^{-20}}J\]


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