A sound wave is produced fron a source ans an echo is heard t seconds...
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
- 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: B. d = \(\frac{\lambda t}{2T}\)
Explanation
V = \(\frac{2d}{t}\)
f\(\lambda = \frac{2d}{t} = \frac{\lambda}{T} = \frac{2d}{t}\)
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