Metals are jam packed with electrons that move freely throughout the metal. Those electrons carry a current making metal a good conductor of electricity, so when the microwaves electric waves hit the surface of the metals, electrons in the metal near the surface then receive the order to move. With all the electrons bunching up at the metals surface not allowing the electric wave to enter causes the wave to be deflected. When the electrons in the metal object move too much and jump from the metal into the air electricity is created and a spark (light) or pop (sound) are created.
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