A wave travels along a string with a speed of 12 m/s. The wavelength of the wave is 0.60 m. What is the frequency of the wave?
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Correct answer
B. 20 Hz
Principle or equation
The wave speed v, frequency f, and wavelength λ are related by v = f λ.
Why this answer is correct
Rearrange to f = v / λ. Substitute v = 12 m/s and λ = 0.60 m: f = 12 / 0.60 = 20 Hz.
Example
If a wave has speed 10 m/s and wavelength 0.5 m, its frequency is 10 / 0.5 = 20 Hz.
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