Question

A wave travels with a speed of 20 m/s and has a wavelength of 0.800 m. what is the period of the wave?

a. 250 ms
b. 40 ms
c. 25 ms
d. 4 ms

Answer 1

b. 40 ms

Step-by-step explanation:

A wave travels at a speed of 20 m/s

the wavelength is 0.800 m

Required

the period

The expression for the velocity of a wave is given as

`v=f \lambda\\\\f= v/ \lambda\\`

substituting our data

`f= 20/0.8\\\\f=25Hz`

But T=1/f

T=1/25

T=0.04s

T=40ms