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Waves — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsWaves2 Marks
Question
What is the condition to be obeyed for receiving an echo?
✓

Answer

The separation between the reflecting surface and source of sound ‘d’ should be greater than $\Big(\frac{1}{20}\Big)^{\text{th}}$ of the velocity of sound, since persistence of sound in human ears is $\frac{1}{10}\text{sec}.$

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