Friday 4 - Friday 4 Doppler Effect For sound waves the...

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Friday 4 Doppler Effect For sound waves, the relation between frequency f and wavelength λ of a harmonic wave is determined by the sound speed in a medium v : v = f . . Wave speed equals frequency times wavelength. This relation always holds if you are "at rest" (that means not moving) relative to the material that the wave is traveling in. In physics, we say that all the objects that are not moving relative to you are in your "frame of reference". The relation between frequency and wavelength given above only holds in the frame of reference of the air (the material that the wave traveling in). If either the source of a sound is moving or if the receiver is moving (or both) relative to the air then you will need to make a correction called the Doppler effect. Actually, there are two separate effects called the Doppler effect: one where the source moves and the other when the receiver moves and we will look at each in turn.
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Friday 4 - Friday 4 Doppler Effect For sound waves the...

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