Question

In quantum theory what is he size of a microbe in order to enter the quantum realm.

Answer 1

Answer:

no, micro organisms can't see with our eyes

only it's possible by a technical item called microscope

Answer 2

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In quantum theory what is he size of a microbe in order to enter the quantum realm.

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The quantum realm (or quantum parameter) in physics is the scale at which quantum mechanical effects become important when studied as an isolated system. Typically, this means distances of 100 nanometers (10−9 meters) or less, or at very low temperatures (extremely close to absolute zero). More precisely, it is where the action or angular momentum is quantized - described as the uncertainty principle and spin, respectively.