Question: Ocean in a shell. What is it that you hear when you hold a seashell (or any closed chamber like a cup or jar) to

Ocean in a shell. What is it that you hear when you hold a seashell (or any closed chamber like a cup or jar) to your ear? We are almost always surrounded by sound that spans every frequency (white noise). What happens if you cup your hands around an ear and vary the size of the chamber? The pitch should change as you vary the chamber. What are you hearing and why?

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