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The speed of sound and the Doppler effect


Sound speed equals the product of wavelength and frequency. At room temperature and atmospheric pressure, sound waves travel at about 343 m/s. If the sound frequency increases, the wavelength will decrease. When the source or observer of a sound is in motion, the speed of sound in the medium does not change, but the frequency of the sound will be shifted through the Doppler effect. If the speed of the sound source exceeds the speed of sound, shock waves form as a result of constructive interference. In this lesson you will use an interactive simulation to investigate the Doppler effect.
The speed of sound and the Doppler effect

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