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The resting hydrogen atom emitted a photon correspondin 2019

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Description

The resting hydrogen atom emitted a photon corresponding to the head line of the Balmer series. What is the speed of an atom after the emission of a photon?

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Additional information

Task 60515. Detailed solution with a brief record of the conditions, formulas and laws used in the decision, the conclusion of the calculation formula and the answer.
If you have any questions about the decision, write. I will try to help.

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