Question

what is quantum physics ?........

Answer 1

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The branch of science in which we study about quantam theory is known as quantam physics.

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Answer 2

The branch of physics concerned with quantum theory.

"quantum physics allows for particles to be in two states at the same time"

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.