Acoustic Doppler effect with universal counter
Principle
If an emitter of sound or a detector is set into motion relative to the medium of propagation, the frequency of the waves that are emitted or detected is shifted due to the Doppler effect.
Benefits
- Easy frequency setting thanks to digital function generator
- Intuitive measuring instrument
- Results well reproducible because of the motor-driven car
Support
Car, motor driven
Attachment for car
Screen with plug, l 100 mm
Light barrier, compact
Track, l 900 mm
PHYWE Universal Counter
PHYWE Digital Function Generator, USB
Holder for two electrodes
Support rod, stainless steel, l = 600 mm, d = 10 mm
Boss head
Stand tube
Loudspeaker / Sound head, 8 ohms
Measuring microphone with amplifier
Connecting cord, 32 A, 500 mm, red
Connecting cord, 32 A, 500 mm, blue
Connecting cord, 32 A, 750 mm, red
Connecting cord, 32 A, 750 mm, yellow
Connecting cord, 32 A, 750 mm, blue
Flat cell battery, 9 V
Battery cell, 1.5 V, baby size, type C
Barrel base expert
Tasks
- Measure the Doppler shift for varying frequencies and velocities for a moving sound emitter. Compare the measurements with the values predicted by theory and validate equation (4).
- Measure the Doppler shift for varying frequencies and velocities for a moving detector. Compare the measurements with the values predicted by theory and validate equation (6).
What you can learn about
- Wave propagation
- Doppler shift of frequency