A Bohr hydrogen atom at rest in free spa...

A Bohr hydrogen atom at rest in free space undergoes a transition from the energy level `n=2` to `n=1`, emitting a photon in the positive `x` direction. Since this photon has momentum, the atom must recoil in the negative `x` direction. Find the recoil velocity of the atom.

`125 cm//sec`

`325 cm//sec`

`225cm//sec`

`425 cm//sec`

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