Question

Scouts at a camp shake the rope bridge they have just crossed and observe the wave crests to be 5.85 m apart. If they shake the bridge three times per second, what is the propagation speed of the waves (in m/s)

Answer 1

Answer:

17.55 m/s

Explanation:

The number of times a wave will pass through a particular point is called frequency so, here the frequency is 3 Hz = f

The distance which is measured between two troughs or crests in a wave is called wavelength so, here the wavelength is 5.85 m = $\lambda$

Velocity is given by

$v=f\lambda\\\Rightarrow v=3\times 5.85\\\Rightarrow v=17.55\ m/s$

The propagation speed of the waves is 17.55 m/s