The
speed of the source vS and the speed of the detector vD are measured relative to air. If air
is stationary, these will be the same as that measured relative to ground.
→
vS
Detector of sound
such as
an ear or
a microphone.
Velocity of the detector
Frequency of sound
measured by the detector
Velocity of the source
Source of sound
such as
a siren or
a loudspeaker.
Frequency of sound emitted by the source
Click and drag the blue line to change the frequency of the sound source