A wave on a string has a frequency of 50 Hz and a wavelength of 0.40 m. What is the speed of the wave?
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Correct answer
A. 20 m/s
Principle or equation
The wave speed is given by v = f λ.
Why this answer is correct
Substitute f = 50 Hz and λ = 0.40 m: v = 50 × 0.40 = 20 m/s.
Example
If a wave has frequency 100 Hz and wavelength 0.2 m, speed = 100 × 0.2 = 20 m/s.
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