Resonance Apparatus Manufacturer,Supplier and Exporter in India
Product Code : EL-PL-13402
Jlab Export is a leading Resonance Apparatus Manufacturer,and suppliers in India
Resonance Apparatus (code EL-PL-13402) is an air-column apparatus, model JL279, for finding the resonance positions of a tuning fork and, from them, the speed of sound. A heavy brass tube stands beside a metre scale on a polished wooden board, and its lower end is sealed into a metal cup whose side tube runs through rubber tubing to a water reservoir. Ambala-based JLab manufactures the apparatus in India.
Specifications
| Parameter | Detail |
|---|---|
| Model | JL279 |
| Tube | Heavy brass tube |
| Scale | Metre scale mounted beside the tube |
| Board | Polished wooden board |
| Lower end | Sealed into a metal cup with a side tube |
| Water supply | Reservoir connected by rubber tubing |
| Quality check | Each resonance apparatus is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Product code | EL-PL-13402 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
Finding the Resonance Lengths
Fill the reservoir so that water rises into the tube, hold a sounding fork just above the open top, and lower the reservoir slowly so the water surface in the tube falls with it. At one level the air column sounds loudly: this is the first resonance, where the column plus a small end correction equals a quarter of a wavelength. Lowering further brings a second resonance at three-quarters of a wavelength. Measure each column length on the metre scale, from the zero at the top of the tube down to the water surface, which acts as the closed end.
Working Out the Speed of Sound
The two resonance lengths differ by half a wavelength, so λ = 2(L₂ − L₁) and the end correction cancels out. The speed of sound is then v = fλ = 2f(L₂ − L₁), with f the frequency marked on the fork. Repeating with forks of other frequencies checks that v stays the same; using the first resonance alone, a graph of length against 1/f has a gradient of v/4 and an intercept that gives the end correction.
Related Sound Items
- Tuning Fork — set of eight aluminium-alloy forks packed in a wooden box.
- Resonance Tube Apparatus — resonance apparatus built round a stainless-steel pipe.
- Signal Generator — audio-frequency function generator to use in place of fixed forks.
Other sound apparatus sits in Physics Lab.
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Last updated: 26 October 2026
