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