Sonometer Apparatus
Product Code : SCL-PMP-11244
Quick answer: This sonometer apparatus is a stretched-string set-up for studying how tension and mass per unit length govern the frequency of a vibrating wire, using resonance with a tuning fork. It also demonstrates stationary waves and is used in school and college practical examinations. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Parameter | Detail |
|---|---|
| Principles demonstrated | Resonance and laws of transverse vibration in stretched strings |
| Variables | Frequency, vibrating length, tension and mass per unit length |
| Supply | One sonometer apparatus assembly |
Construction material, box length, wire type, scale range, bridges, pulley and masses are confirmed with the quotation, together with any fork, rider or hammer.
Tension and mass per unit length experiments
When the wire is set vibrating by a fork, transverse waves run to the bridges and reflect, forming a stationary wave with nodes at the bridges and an antinode between them. The speed of these waves is v = sqrt(T / m), so a tighter or lighter wire carries them faster and, for the same vibrating length, vibrates at a higher frequency.
- Choose one fork and load the hanger with a known mass M to set the tension T = Mg.
- Find the resonant length l with a paper rider.
- Increase the load in equal steps and find the new resonant length each time.
- Plot l^2 against T; a straight line through the origin verifies the law of tension.
- From the slope and the fork frequency, calculate the mass per unit length m of the wire.
Repeating the experiment with a second wire of different thickness or material at the same tension shows the law of mass: the resonant length changes in proportion to 1 / sqrt(m).
Key features
- Covers the law of tension and the law of mass for vibrating strings.
- Shows stationary waves with nodes at the bridges.
- Vibrating length and applied tension can be measured for graphical analysis.
- Works with a suitable vibration source such as a tuning fork.
- Suited to structured practical examinations in schools and colleges.
- Reusable when the wire and loading system are handled correctly.
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the sonometer at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Physics Miscellaneous Products products
- Tuning Fork Set of 8 (SCL-PMP-11243)
- Globe 12" (SCL-PMP-11238)
- Reflection of Sound Apparatus (SCL-PMP-11222)
- Biogas Plant Working Model (SCL-PMP-11217)
- Melde's Apparatus (SCL-PMP-11206)
- PM Shri Science Kit (SCL-PMP-11197)
The full range is in the Physics Miscellaneous Products section of the Physics Lab range.
Frequently asked questions
How does tension affect the frequency of a sonometer wire?
Frequency is proportional to the square root of the tension, so four times the load doubles the frequency for the same vibrating length.
Can the sonometer find the mass per unit length of a wire?
Yes. With a fork of known frequency f, a graph of resonant length squared against tension has slope 1 / (4 f^2 m), from which m is calculated.
What is the price of the sonometer?
Prices are not published on the website. Add the sonometer to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code SCL-PMP-11244 and the quantity, to receive a quotation.
Does Lab Exports manufacture the sonometer?
Yes. Lab Exports manufactures the sonometer at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code SCL-PMP-11244.
Request a quote
Email [email protected] with the house code SCL-PMP-11244 and the quantity, or add the sonometer to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
