Question

what is quantum physics?

Answer 1

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♦ Quantum physics => Quantum physics is a branch of physics in which we learn about microscopic particles.

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Answer 2

Quantum physics is necessary to understand the properties of solids, atoms, nuclei, subnuclear particles and light. In order to understand these natural phenomena, quantum principles have required fundamental changes in how humans view nature. To many philosophers (Einstein included), the conflict between the fundamental probabilistic features of quantum mechanics and older assumptions about determinism provided a cognitive shock that was even more unsettling that the revised views of space and time brought by special relativity.
the branch of physics concerned with quantum theory