A nucleus mass number 208 atomic number 81 emits a 4479 kev


A nucleus (mass number: 208; atomic number: 81) emits a 447.9 keV photon. The nucleus is initially at rest. Calculate the nucleus's KE after photon emission. Momentum of the photon = E/c. Momentum of the nucleus is sqrt(2Km). Please clearly explain all steps.

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Physics: A nucleus mass number 208 atomic number 81 emits a 4479 kev
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