The distance between the observer (source of sound) and wall is 500 m. – McqOptions

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1.	The distance between the observer (source of sound) and wall is 500 m. The observer hear the first echo after 2 sec then velocity of the sound is
A.	250 m/s
B.	500 m/s
C.	750 m/s
D.	1000 m/s
Answer» C. 750 m/s

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