a sound wave is produced fron a source ans an echo is heard t seconds afterwards. If d is the distance of the reflecting surface from the source, v the speed, p the wavelength and T the period of the wave, then
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A.
d = (frac{2t}{lambda}) -
B.
d = (frac{lambda t}{2T}) -
C.
d = (frac{2T}{lambda t}) -
D.
d = (frac{lambda T}{2t})
Correct Answer: Option B
Explanation
V = (frac{2d}{t})
f(lambda = frac{2d}{t} = frac{lambda}{T} = frac{2d}{t})