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Calculations Involving the Doppler Effect

Velocity of sound relative to air = v

Frequency of emitted sound = f

Apparent frequency of received sound = f.

Moving Source (stationary observer)

If the source moves with a velocity of magnitude vs (relative to the air) then the velocity of the waves relative to the source is (vvs).

In general,

so in this case,

The apparent frequency of the sound, f, as measured by the observer, will be equal to v/DELTASMRED.

Therefore, the apparent frequency is given by




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