Question

What is quantum physics in brief

Answer 1

Quantum theory is the theoretical basis of modern physics that explains the nature and behavior of matter and energy on the atomicand subatomic level. The nature and behavior of matter and energy at that level is sometimes referred to as quantum physics and quantum mechanics.
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Answer 2

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Quantum mechanics is the body of scientific laws that describe the behavior of photons, electrons and the other particles that make up the universe. Quantum mechanics is the branch of physics relating to the very small. It results in what may appear to be some very strange conclusions about the physical world