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Dipper effect
The apparent change in detected frequency by the listener , because the sound source and the listener have different velocities relative to the medium of sound propagation.
Moving towards
Frequency of listener greater than the frequency of the sound sound source .
More waves are incident on the listener per second
Moving away
Frequency of listener less than frequency of sound source.
Less waves are incident on the listener per second
Converting Velocity
Kmh-^(-1) to m.s^(-1) = divide by 3,6
Converting Frequency
kHz to Hz= x1000