Answer:
b. 40 ms
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
[tex]v=f \lambda\\\\f= v/ \lambda\\[/tex]
substituting our data
[tex]f= 20/0.8\\\\f=25Hz[/tex]
But T=1/f
T=1/25
T=0.04s
T=40ms
