Question: A hydrogen atom at rest in the laboratory emits the Lyman a radiation. (a) Compute the recoil kinetic energy of the atom. (b) What fraction

A hydrogen atom at rest in the laboratory emits the Lyman a radiation. 

(a) Compute the recoil kinetic energy of the atom. 

(b) What fraction of the excitation energy of the n = 2 state is carried by the recoiling atom?

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