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A hydrogen atom, initially at rest in the laboratory, emits one photon, with the lowest energy...

A hydrogen atom, initially at rest in the laboratory, emits one photon, with the lowest energy possible, in the Lyman spectral series. a.Which two energy levels are involved in this transition, and what are their energies? b.What is the energy and momentum of the emitted photon? c.What fraction of this energy is carried away by the recoiling atom (Hint: use conservation of momentum).

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