If the speed of a wave decreases but the wavelength remains constant, what happens to the frequency of the wave?

Answer 1

According to the wave equation c = fλ, where c is the speed of the wave, f is the frequency, and λ is the wavelength, if the speed of the wave decreases but the wavelength remains constant, the frequency of the wave must also decrease in order to maintain the equation. Therefore, the frequency of the wave decreases.