Motion toward the source increases frequency as the observer on the right passes through more wave crests than she would if stationary. ![]() (c) The same effect is produced when the observers move relative to the source. The opposite is true for the observer on the left, where the wavelength is increased and the frequency is reduced. The wavelength is reduced, and consequently, the frequency is increased in the direction of motion, so that the observer on the right hears a higher-pitched sound. (b) Sounds emitted by a source moving to the right spread out from the points at which they were emitted. ![]() (a) When the source, observers, and air are stationary, the wavelength and frequency are the same in all directions and to all observers. \):- Sounds emitted by a source spread out in spherical waves.
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