Question

The speed of a wave is 65 m/sec ifthe wavelength of the wave is 0.8 meters what is the frequency of yhe wave

Answer 1

The basic relationship between frequency, wavelength and speed of a wave is given by
$v=\lambda f$
where
v is the wave speed
f is its frequency
$\lambda$ is its wavelength

Re-arranging the equation and using the data of the problem, we find the frequency of the wave:
$f= \frac{v}{\lambda}= \frac{65 m/s}{0.8 m}=81.3 Hz$