Quick Answer: The Doppler Effect Kit is a sound wave demonstration kit that lets students hear the pitch of a moving source rise as it approaches and fall as it moves away.
Last updated: October 2026
Key Features
Demonstrates the Doppler effect with a moving sound source.
Pitch appears higher as the source approaches and lower as it moves away.
Explains frequency, wavelength, wavefront spacing and observer-source motion.
Uses a battery-driven sound source arrangement.
Links classroom physics with sirens, passing vehicles and other moving sources.
About This Product
After checking that the sound source, battery section and moving parts are secure, the source is switched on and moved or swung as the kit design directs, in an open area under teacher supervision. Students listen for the change in pitch as it travels towards and away from them. Hearing the effect directly makes it easier to grasp than a diagram alone, especially in wave motion and acoustics lessons. Besides buyers across India, the Doppler Effect Kit can be exported to institutions in Qatar, Cabo Verde, Brazil, Cameroon, Panama and Palestine.
Frequently Asked Questions
Q1. What causes the change in pitch? Relative motion between the source and the observer. Wavefronts are compressed as the source approaches and spread out as it moves away.
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