why does our voice echo on hills
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The voice gets bounced back from the hill
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ExplanationAn echo is a sound that returns to its source like a boomerang. In order to return back in the direction of its source, a sound or light wave must either trace a path in space that is reminiscent of a parabola (like the curvilinear motion of light traveling around the sun as a consequence of the curvature of space itself due to the sun’s gravity, as predicted by General Relativity) or simply, reflect from a surface. An echo is the latter, it is a reflection of sound waves from objects in the vicinity of the source.:
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