Question

What is echo in ICSE class 10 physics.
Give perfect answer only.
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Answer 1

$\huge\bf\underline\red{Answer:)}$

The sound heard after reflection from a distant obstacles after the original sound has ceased, is called an echo.

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Answer 2

$\huge\mathcal\pink{ANSWER⤵}$

When a sound wave is incident on a solid or liquid surface, it bounces back into the same medium. This is known as the reflection of sound. Like light, sound too undergoes reflection from any hard surface and obeys the same laws of reflection, which light obeys. Sound waves need polished or rough surfaced obstacles to get reflected.

$Laws \:of \:Reflection \:of \:Sound\::-$

The angle of incidence is always equal to the angle of reflection.

The incident sound wave, the reflected wave and the normal at the point of incidence are in the same plane.