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प्रश्न
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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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संबंधित प्रश्न
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(ii) at right angles to the direction of wave.
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