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 = \(\frac{\lambda T}{2t}\)
Explanation
Correct Option
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Folafoluwa2007
1 year ago
V=2d/t
where
V is speed
d is distance
t is time
p is wavelength
F is frequency
V=2d/t
where V=pF
Substituting V=pf into V=2d/t
pF=2d/t
where F=1/T
p×1/T=2d/t
Cross multiply
pt=2dT
Making d the subject of the formula
d=pt/2T
(remember p is wavelength)
Thanks
