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1answer
843 views

Explanation of energy levels in molecules, atoms, nuclei and their relationship

Why are the energy levels of molecules, the atoms that form them and the nuclei inside the atoms considered separately? Or phrased in a different way- what is it that makes their energy levels so ...
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2answers
94 views

Energy behind door knocking?

How do we estimate the energy released from knocking on a wooden table or a door?