# The fisherman noticed that in 20 seconds the float makes 40 vibrations and the distance between

May 26, 2021 | education

| **The fisherman noticed that in 20 seconds the float makes 40 vibrations and the distance between adjacent wave crests is exactly 2 m. What is the wave propagation speed?**

Initial data: t (duration of float oscillations) = 20 s; n (the number of vibrations that the float made) = 40 vibrations; λ (distance between adjacent wave crests, wavelength) = 2 m.

1) Determine the period of oscillation of the float: T = t / n = 20/40 = 0.5 s.

2) Let’s calculate the speed of wave propagation: υ = λ / T = 2 / 0.5 = 4 m / s.

Answer: Waves propagate at a speed of 4 m / s.

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