Answers

2016-02-17T21:48:43+05:30
2d = vt is the formula of echo.
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2016-02-18T16:51:25+05:30
D = v*t or t = d/v is the formula of echo where,d = the distance the sound wave traveled back and forth,v = velocity of sound, andt = the time it takes the sound to go back and forth.
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