How does density affect frequency?

Density affects frequency through its influence on the speed of sound in a medium. In denser materials, sound waves typically travel faster, which can lead to changes in frequency when considering wave behavior. When sound moves from one medium to another with different densities, its speed changes, which can alter its wavelength and, consequently, its frequency. This relationship is described by the wave equation, where frequency is inversely related to wavelength when speed is constant.