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An orbital electron in a particular stat...

An orbital electron in a particular state of hydrogen has the radius R. This orbital electron is exited to another state by some energy transfer to the hydrogen atom so that its radius is now 9R. Then
A) its energy is now ninth of the original energy
B) its velocity is now one third of the original velocity
C) its angular momentum is three times the original angular momentum
D) it will come to the original state by emitting maximum of 2 photons

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