What happens to the frequency of a sound wave when it travels from air into water?

💡 Solution & Explanation

The frequency of a sound wave remains constant when it travels from one medium to another because it is determined entirely by the vibrating source. Although velocity and wavelength change with the density and elasticity of the medium, frequency stays unaffected. Changes in medium affect wave propagation speed and refraction phenomena instead. This foundational principle of wave mechanics is frequently tested in general science sections.