Use a sonometer as a physics laboratory equipment to study the vibration of a stretched string and its relation to sound frequency.

It demonstrates how the frequency of sound depends on the tension, length, and mass per unit length of the wire.

The setup includes a metal wire stretched over a hollow box, with one end attached to a hanging mass over a pulley to apply tension.

When the wire is plucked or vibrated, it produces a sound whose frequency changes based on:

↑ Tension → ↑ Frequency
↑ Mass per unit length → ↓ Frequency
↑ Length → ↓ Frequency
It is used in labs to verify the formula:
f ∝ (1/L) × √(T/μ),
where f is frequency, L is length, T is tension, and μ is linear density

Therefore, the sonometer helps students understand the physics of musical instruments and wave behavior in stretched strings.