Question

The distance between two successive crests in a wave is 1.25 m, and the source generates 15 crests in 5.0 s. What is the speed of the wave?

Answer 1

Given:

$\lambda=1.25\:\rm m$

$N=15$

$t=5.0\:\rm s$

The frequency of oscillation

$$f=\frac{N}{t}=\frac{15}{5.0}=3.0\:\rm Hz$$

Hence, the speed of the wave

$$v=f\lambda=3.0*1.25=3.75\:\rm m/s$$