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प्रश्न
A girl claps and hears the echo after reflection from a cliff which is 660 m away. If the velocity of sound is 330 ms-1, calculate the time taken for hearing the echo.
संख्यात्मक
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उत्तर
Velocity of sound = `"distance travelled"/"time taken" = (2"d")/"t"`
t = `(2"d")/"v" = (2 xx 660)/330` = 4s
Thus, the girl hears the echo after 4s.
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