Question

If the frequency of the wave is 150 hertz then find the velocity and the wavelength of the wave

Answer 1

It is not possible to determine the other two using this single parameter.

However, if it is given that the wave is an electromagnetic wave, the velocity shall definitely be $3 * 10^8$ m/s.

So, wavelength in that case would be:

$wavelength = \frac{speed}{frequency} = \frac{3 * 10^8}{150} m = 2 * 10^6 m$

Or, wavelength is 2000 km.