Because there is not radiation in the nuclear sense even though we say “nuke it” when microwaving food.
At the simplest, this is using magnetism to create friction. Try showing her how static electricity can move water. Turn on the faucet on the lowest strength, so it’s a steady trickle. Run a comb through your hair, then move the comb near the water, the stream bends. Microwave is basically doing this fast enough to create heat, like rubbing your hands together.
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