What is quantum physics in simple terms or with a real-world example?

Question

What is quantum physics in simple terms or with a real-world example?

In: Physics

Answer 1

energy can only enter and exit electron in fix “quantity” AKA energy level instead of arbitrary small amount. If the incoming photon energy is too small or too large, it will just skip it.

real world example: photovolatic cell usually can only absorb a single wavelength of light. And the reverse of photovolatic cell, LED, where you apply a voltage, the electron only emit a certain wavelength of light. So technically every solar cell is a led inverse direction, and every led is a solar cell inverse direction. But usually the reverse flow efficiency is terrible compare to its normal use.