When a sound wave bends around a barrier so you can still hear the sound even though you cant see the source the wave has undergone what?

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The sound wave has undergone refraction.
Diffraction
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In Physics

Do sound waves exist even if you can't hear them?

Yes, sound waves exist which are not audible to the human ear. Humans can hear sound waves having frequency between 20 - 20,000 Hz. Other all frequencies lie outside our heari