Question
When a hydrogen atom emits a photon in going from n =5 to n = 1, its recoil speed is almost
The correct answer is:
Energy of photon emitted,
Momentum of photon 
The momentum of hydrogen atom is equal and opposite to the momentum of photon. If is the mass of hydrogen atom 
and v is recoil speed of hydrogen atom , then
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Statement 2: Radius of nucleus is directly proportional to the cube root of mass number
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Statement 2: The whole mass of the atom is considered in the nucleus
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, where symbols have usual meaning.
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