WAEC - Physics (2021 - No. 26)

Determine the speed of the wave.

64 cm/s

32 cm/s

24 cm/s

72 cm/s

Speed = Wavelength x Frequency

V = fλ, where frequency = 1/period, f = 1/T.

The period was given as 0.125sec and wavelength = 9cm

: f = 1/T = 1/0125 = 8.

V = fλ = 8 × 9 = 72m/s