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It is the body of scientific laws that describe properties of  photon ,electron and other particles that makes u the universe.
i hope this helps u...
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Mechanics it itself the study of motion. Quantum mechanics is just the study of electrons, photons and many other similar particles, which makes the universe.
It may be defined easily, but it is hard to study any. It is so deep.

Thank you.
Hope this will help you.
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