You can often hear a person speaking from behind a tall fence even if you cannot see them. Which property of sound waves explains this phenomenon?
Diffraction
Diffraction allows sound waves to bend around obstacles like a fence, letting you hear a person speaking even when you cannot see them.
Reflection, polarization and refraction describe other wave behaviours, not the bending of waves around obstacles seen here.
Hence, Diffraction is the correct answer.
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