When sound travels from air into water, does the frequency of the wave change? The speed? The wavelength? Explain your reasoning.

Given that the sound travels from the air to water.

The number of wave cycles in a second is termed as frequency. The wave sped is the distance travelled by the wave in unit time, the wavelength of the wave is the distance between the two crest and the troughs of the wave.

Note the frequency of wave depends on its source so it will not change with the medium.

The speed of the wave depend on the properties of the material and is the product of the wavelength and the frequency of the wave. Since, water and air have different properties so the speed of the wave will change.

Consider the relation between the wavelength and the frequency of the wave as:

$\lambda =\frac{v_s}{f}$

Note that the speed will change with the wavelength of the sound.

Therefore, the frequency will be constant, while the speed and wavelength of the sound will change.