A man standing on the seashore determined that the distance between successive wave crests is 8 m. In addition, he calculated that 24 wave crests passed by him in 1 minute. Determine the speed of propagation of the wave.
l = 8 meters – distance between successive wave crests (wavelength);
n = 24 – the number of waves passing by the observer during the time interval t;
t = 1 minute = 60 seconds – time span.
It is required to determine u (meter per second) – the speed of wave propagation.
Let’s determine the frequency of the wave:
v = n / t = 24/60 = 0.4 Hertz (second-1).
Then, to calculate the speed of wave propagation, you need to use the following formula:
u = l * v = 8 * 0.4 = 3.2 meters per second.
Answer: the wave propagation speed is 3.2 m / s.
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