A hydrogen atom initially in the ground state is excited by absorbing a photon of wavelenght 980 Å.The redius of the atom in the excited state ,in terms of Bohr radius `a_(0)` will be : `(hc= 12500 eV- Å)`
A
`25a_(0)`
B
`9a_(0)`
C
`16a_(0)`
D
`4a_(0)`
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