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Question
What is Doppler Effect?
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Definition
• The change in frequency of a wave (or other periodic event) for an observer moving relative to its source.
Stages
• Sound source and Listener are static.• Sound source Moves toward a stationary Listener.• Sounding source moves away from a stationery Listener• Listener Moves toward a stationery source.• Listener Moves away from the stationery source.• Sound source and Listener both going away.
Listener Moves toward a stationery source
This expression indicates that the frequency of sound as heard by the listener is
decreased and he will detect a lower pitch of sound.
Listener Moves away from the stationery source.
• The frequency of sound is decreased frequently and he will
detect a lower pitch of sound.