A wave has a wavelength of 3mm and a frequency of 4hz. at what speed does the wave travel? Explain how you know that your answer is correct.please...

The wavelength of a wave is the distance between two
adjacent points where the shape of the wave is found to repeat. The wavelength is
expressed in the unit meter. The frequency of the wave is the number of wavelengths that
pass a point in a given interval of time, usually a second. Frequency is expressed in
the unit Hertz which is equivalent to per second.

As the
speed of the wave is the time taken by it to travel over a distance, it is given as
wavelength*frequency. The product of wavelength and frequency has units of meters per
second which is the same as the unit of speed.

The wave
given in the problem has a wavelength of 3 mm and a frequency of 4
hz.

The speed of the wave is 3*4 = 12 mm/s = 1.2*10^-2
m/s