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  4. The minimum distance of a reflector to hear the echo of monosyllabic sound is (speed of sound is 330 text ms-1 )

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Q. The minimum distance of a reflector to hear the echo of monosyllabic sound is (speed of sound is $ 330\text{ }m{{s}^{-1}} $ )

JamiaJamia 2009

Solution:

Monosyllabic sound reaches the listener after reflection in $ \frac{1}{5}s $ . Distance between source and listener is $ d=v\left( \frac{t}{2} \right)=330\times \left( \frac{1}{2}\times \frac{1}{5} \right) $ $ d=330\times \left( \frac{1}{10} \right)=33\,m $