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."(adsbygoogle = window.adsbygoogle || []).push({});

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??

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# Standing waves?

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