Answer: 72 m
Explanation:
The velocity [tex]V[/tex] of a wave is expressed as the distance traveled by a periodic perturbation (which is the wavelength) [tex]\lambda[/tex] divided by the wave's period [tex]T[/tex], which is a time interval:
[tex]V=\frac{\lambda}{T}[/tex]
Where [tex]V=18 m/s[/tex] and [tex]T=4 s[/tex]
Isolating [tex]\lambda[/tex]:
[tex]\lambda=VT[/tex]
[tex]\lambda=(18 m/s)(4 s)[/tex]
Finally:
[tex]\lambda=72 m[/tex] This is the value of the wavelength
