Determine the speed of the wave.
- 64 cm/s
- 32 cm/s
- 24 cm/s
-
72 cm/s
The correct answer is: D
Explanation
Speed = Wavelength x Frequency
or
V = fΞ», where frequency = 1/period, f = 1/T.
The period was given as 0.125sec and wavelength = 9cm
: f = 1/T = 1/0125 = 8.
V = fΞ» = 8 Γ 9 = 72m/s