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Physics

What is meant by an echo? State two conditions necessary for an echo to be heard distinctly.

Sound

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Answer

The sound heard after reflection from a distant obstacle (such as a cliff, a hillside, the wall of a building, edge of a forest, etc.) after the original sound has ceased, is called an echo.

The two conditions for an echo to be heard distinctly are —

  1. The minimum distance between the source of sound (or observer) and the reflector in the air must be 17 m.
  2. The size of the reflector must be large enough as compared to the wavelength of the sound wave

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