When the wavelength of a wave decreases, the frequency of the wave increases. Similarly, when the wavelength of a wave increases, the frequency of the wave decreases. This relationship between wavelength and frequency is described by the equation: frequency = speed of wave / wavelength. Hence, when the wavelength decreases, the frequency must increase to maintain a constant wave speed. Conversely, when the wavelength increases, the frequency must decrease to maintain a constant wave speed.
