Question

what is quantam thoery?

Answer 1

Hey buddy
here's the answer

a theory of matter and energy based on the concept of quanta, especially quantum mechanics is the QUANTUM THEORY ...

Answer 2

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Quantum mechanics, including quantum field theory, is a fundamental theory in physics which describes nature at the smallest scales of energy levels of atoms and subatomic particles. Classical physics, the physics existing before quantum mechanics, describes nature at ordinary scale.

[A theory of matter and energy based on the concept of quanta, especially quantum mechanics.]
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