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## Main Question or Discussion Point

I am reading an article on black holes and they state, "Now what kinds of waves are possible inside a black hole? The answer is standing waves, waves that "fit" inside the black hole with a node at the event horizon."

Can anyone explain to me why they know the answer is standing waves, and what do they mean when they say they "fit" inside the black hole??

Can anyone explain to me why they know the answer is standing waves, and what do they mean when they say they "fit" inside the black hole??