Question #4
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A person stands on horizontal ground at point P between two parallel vertical cliffs separated by a
distance as shown in the figure. He fires gun shot and hears multiple echoes. The second echo arrives
1.92 s after the first echo and 1.47 s before the third Assume only the sound travelling parallel to the
ground and reflecting from the cliffs. Speed of the sound is 330 m/s. What is the value of d ?
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search in s.chand text book
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