Physics Practicals Class 11

Sonometer – Law of Tension & Law of Length

  • Teach science experiments in a gamified way
  • Boost conceptual clarity and knowledge retention
  • Aligned with National Education Policy 2020
  • Helpful in getting NAAC accreditation
  • CBSE, ICSE, and state boards aligned curricula
  • Engaging simulations with easy-to-teach instructions

About Simulation

  • During the simulation, you will gain a comprehensive understanding of resonance and resonant frequency, exploring the laws of length and tension using the sonometer.
  • Throughout the process, you can learn how the natural frequency aligns with the transmission frequency, facilitating energy transfer.
  • At the end of the simulation, you will acquire the ability to correlate the frequency of vibration with both the resonating length of the string and its tension.
  • Furthermore, you can grasp the concept of resonance and resonant frequency, deepening your understanding of vibrational phenomena.

Physics Practical Class

  • Additionally, you will comprehend the fundamental laws governing tension, mass, and length concerning the stretched string, enhancing your knowledge of mechanical dynamics.

Simulation Details

Duration – 30 Minutes
Easily Accessible
Languages – Odia & English
Platforms – Android & Windows


Sonometer consists of a hollow rectangular wooden box of more than one-meter length, with a hook at one end and a pulley at the other end. One end of a string is fixed at the hook and the other end passes over the pulley. A weight hanger is attached to the free end of the string. Two adjustable wooden bridges are put over the board so that the length of string can be adjusted.

Physics Practical Class

Production of transverse waves in stretched strings:

If a string of length l having mass per unit length m is stretched with a tension T, the fundamental frequency of vibration f is given by

Physics Practical Class

Laws of transverse vibrations on a stretched string:

Law of Length:
The frequency of vibration of a stretched string varies inversely to its resonating length (provided its mass per unit length and tension remain constant.)

Physics Practical Class

Law of Tension: The frequency of vibration of a stretched string varies directly as the square root of its tension, (provided its resonating length and mass per unit length of the wire remains constant).

Physics Practical Class

Requirements for this Science Experiment

  • Paper rider
  • Weight hanger
  • Tunning forks
  • Rubber pad
  • Wedge
  • Slotted weights

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