Problem: An electron in hydrogen is in the n = 5 ground state when it decays to the ground state. Estimate the recoil speed of the atom after the electron drops to the ground state. Note that the mass of a proton is about 1.67x10-27 kg, and the mass of an electron is about 9.11x10-31 kg.

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An electron in hydrogen is in the n = 5 ground state when it decays to the ground state. Estimate the recoil speed of the atom after the electron drops to the ground state. Note that the mass of a proton is about 1.67x10-27 kg, and the mass of an electron is about 9.11x10-31 kg.

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