Physics
WAEC 2008
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 = \(\frac{2t}{\lambda}\)
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B.
d = \(\frac{\lambda t}{2T}\)
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C.
d = \(\frac{2T}{\lambda t}\)
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D.
d = \(\frac{\lambda T}{2t}\)
Correct Answer: Option B
Explanation
V = \(\frac{2d}{t}\)
f\(\lambda = \frac{2d}{t} = \frac{\lambda}{T} = \frac{2d}{t}\)
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