A man standing 825 meters away from a cliff (steef rock) Fires a gun. After how long will he hear it's echo ? Speed of sound in air is 330 m/s.
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Distance of the man from the cliff(d)=825mSpeed of sound(v)=330 m/s
By the echo formula,
2d=vt
t=2d/v=2×825/330=1650/330=5s(Ans.)
Hence,the man would hear the echo after 5s