Doppler Effect
If we listen to the sound produced by a moving object (or we move relative to the sound source) we not necessarily observe the sound that was originally produced
Example: car passes nearby you
-the volume changes (increases after which decreases)
-the frequency changes (higher after which lower)
Shift of frequency due to motion --> Doppler effect
- frequency with which crests hit our ears --> pitch of
the sound (ears sensitive to the frequency!)
- if the source and ear are stationary relative to each
other, the frequency heard is the one emitted
- if the source is moving the listener hears another
frequency: waves crowd together in the forward
direction and spread out in the backward direction
(we observe higher frequency while the object moves
toward us, and lower when departs)
Doppler effect also occurs when the receiver