If an echo is experienced after speaking in a large open area, what is the underlying mechanism causing the repetition?

Answer

Physical reflection governed by the speed of sound and distance.

When a sound repeats after speaking in a large open area, it is the external physical phenomenon where sound waves bounce off surfaces and return to the listener, governed by the physics of sound speed and distance.

If an echo is experienced after speaking in a large open area, what is the underlying mechanism causing the repetition?

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