An atom can exist in two states , ground state of M and excited state of mass M+Δ , it goes to excited state by absorption of an photon, what is the photon frequency in the in the lab frame of reference ( where the atom is initially at rest )?(adsbygoogle = window.adsbygoogle || []).push({});

A simple energy equation gives the answer:

E=( M+Δ -M)[itex]c^{2}[/itex]=hγ

γ=Δ[itex]c^{2}[/itex]/h

But my intuition says that I am overlooking something and can't be that simple..

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# Special relativity and quantum mech

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