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Energy is the conserved quantity associated to time-translation invariance and represents the work a system is capable of doing. Use this tag for questions about energy, and consider adding the [energy-conservation] tag if it is specifically about its conservation.

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What does recoil kinetic energy of an atom mean?

I am confused on what the book means by "the atom must also have a 'recoil' kinetic energy". …
Aleyna Koro's user avatar