The relationship between wavelength and frequency is described by the equation: frequency = speed of light / wavelength. This means that they are inversely related; as the wavelength of a wave increases, its frequency decreases, and vice versa. In the context of electromagnetic waves, shorter wavelengths (like ultraviolet light) correspond to higher frequencies and contain more energy. Conversely, longer wavelengths (like radio waves) have lower frequencies and energy. This relationship is fundamental in understanding various physical phenomena, including light and sound.