Question

A porpoise emites a sound of 57 hz, how long is the wavelength on the water?

Answer 1

for any wave, the equation
\[v=\lambda f\]
is true, where the speed of the wave v is equal to its wavelength, lambda, times its frequency, f.

Using the speed of sound in fresh water (ie, if our porpoise is a Yangtze finless porpoise) at 25ºC
\[v=1497m/s\]
So then we can solve for the wavelength using
\[\lambda=\frac{v}{f}\]
where lambda will be in units of meters/