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Determine the speed of the wave.

...

Determine the speed of the wave.

A.

64 cm/s

B.

32 cm/s

C.

24 cm/s

D.

72 cm/s

View answer & explanation

Correct answer is D

Speed = Wavelength x Frequency

or

 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

 

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