If the velocity of sound in air is 340 m/sec and x is the minimum distance between sound source and reflecting surface to get echo from general sound, then (A) x = 17 m (B) 51 m (C) x = 34 m (D) 68 m

If the velocity of sound in air is 340 m/sec and x is the minimum dist

1.	If the velocity of sound in air is 340 m/sec and x is the minimum distance between sound source and reflecting surface to get echo from general sound, then (A) x = 17 m (B) 51 m (C) x = 34 m (D) 68 m
Answer» Correct option is (A) x = 17 m

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If the velocity of sound in air is 340 m/sec and x is the minimum distance between sound source and reflecting surface to get echo from general sound, then (A) x = 17 m (B) 51 m (C) x = 34 m (D) 68 m

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