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Doppler Effect
Doppler Effect (Product Code: SLE/PHY/158) is a demonstration apparatus used to let a class hear the Doppler effect — the change in pitch from a moving sound source — in physics lessons on sound and waves. It consists of a plastic box with a sound source that runs on 9 V batteries (not included) and a strong string for whirling it in a circle. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Components | Plastic box with sound source; strong string for rotation |
| Power | 9 V batteries (not included) |
| Length | 13 cm |
| Height | 8 cm |
| Width | 9 cm |
| Demonstrates | The Doppler effect with sound |
| Product code | SLE/PHY/158 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is the Doppler Effect Apparatus Used For?
With the sound source switched on, the teacher whirls the box in a circle on its string. Students standing to one side hear the pitch rise as the box moves towards them and fall as it moves away, while the person swinging it hears an almost steady note because their distance from the box hardly changes. That contrast is a memorable way to show that the effect depends on relative motion between source and listener.
The demonstration leads naturally to everyday examples such as passing sirens, and to applications like speed measurement and the red shift of distant galaxies. Use a hall or open space, check the string and its attachment before each session, and keep students well back from the swinging box. It is a compact Doppler effect kit that fits into any sound wave experiment unit for schools in India and abroad.
What to Specify When Ordering
- Number of units required for your classes.
- Batteries — 9 V batteries are not included, so arrange them locally or ask us about adding them to the quotation.
- Any other sound and wave apparatus you want quoted at the same time.
Supplier
The Doppler Effect apparatus is supplied by Jain Scientific Equipments Private Limited, trading as ScienceLab, from Ambala, Haryana, India. It sits alongside the company's range of sound and wave teaching apparatus, so a school equipping a waves unit can request everything in one enquiry. Schools, colleges, dealers and institutional buyers across India and international markets are supplied. Learn more on our company profile.
Related Physics Lab Equipment
These items complete a practical unit on sound and waves:
- Tuning Fork Set, Steel — boxed forks marked with their frequencies, for pitch and frequency lessons.
- Resonance Apparatus with Brass Tube — for resonance investigations in air columns.
- Signal Generator & Amplifier — produces tones of chosen frequency for sound experiments.
- Loudspeaker Unit — boxed speaker with 4 mm sockets for playing generated tones.
Browse more apparatus in our Physics Lab Equipment category.
Frequently Asked Questions
What is included with the Doppler Effect apparatus?
The Doppler Effect apparatus includes a plastic box containing a sound source and a strong string for swinging the box in a circle. The 9 V batteries that power the sound source are not included and must be arranged separately.
How is the Doppler Effect apparatus used in class?
To use the Doppler Effect apparatus, switch on the sound source and whirl the box in a circle on its string. Listeners at the side hear the pitch rise as the box approaches and fall as it moves away, demonstrating the Doppler effect.
Why does the person swinging the Doppler Effect apparatus hear little change?
The person swinging the Doppler Effect apparatus stays at the centre of the circle, so the box neither approaches nor recedes from them. Without relative motion towards or away from the listener there is little pitch change, which helps explain the effect.
What size is the Doppler Effect apparatus?
The Doppler Effect apparatus measures 13 cm in length, 8 cm in height and 9 cm in width. The compact plastic box is designed to be swung on its string, so the whole demonstration fits easily into a classroom or hall.
Who supplies the Doppler Effect apparatus?
The Doppler Effect apparatus is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, Haryana, India, to schools, colleges, dealers and institutions across India and international markets.
What details should I send for a Doppler Effect apparatus quotation?
For a Doppler Effect apparatus quotation, send the product code SLE/PHY/158, the quantity, whether batteries or other sound apparatus should be added, and the delivery location through our contact page.
Request a Quote
To request a quotation for the Doppler Effect apparatus (SLE/PHY/158), use our contact page or add it to the enquiry cart with the other sound and wave items on your list.
Last updated: 24 September 2026
