Physics Practicals Class 9

Sound Needs a Medium to Travel

  • 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

  • The simulation will explore the concept that sound requires a medium to travel through.
  • Participants will engage in interactive experiments demonstrating how sound waves propagate through different mediums.
  • Through simulated scenarios, users will observe how sound behaves in various mediums such as air, water, and solids.
  • Experimentation will involve adjusting parameters such as medium density and temperature to observe their effects on sound transmission.
  • The simulation will provide a hands-on experience akin to a physics lab, allowing users to manipulate variables and observe the resulting changes in sound propagation.

Physics Practical Class

  • Real-life scenarios will be integrated into the simulation, offering practical applications of understanding sound transmission through different mediums.
  • Participants will gain a deeper understanding of the fundamental principle that sound waves cannot travel through a vacuum and rely on a medium for propagation.

Simulation Details

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


What is sound?
Sound is a mechanical wave that needs a material medium, like air, water, steel, etc., for its propagation. We can describe a sound wave by its frequency, wavelength, and velocity. The sound wave is a longitudinal wave, i.e., the particles of the medium vibrate in a direction parallel to the direction of the propagation of the wave.

A sound wave needs a medium to travel
A sound wave travels in the form of a longitudinal wave and it requires a material medium for its propagation. Sound always originates from some vibrating body. These vibrations are produced by tuning forks, drums, bells, the strings of a guitar, etc.

Human voice originates from the vibrations of the vocal cords, and the sound from the musical instruments is due to the vibrations of the air columns. In some cases, the vibrating frequency of the source may be so very small or so very large that it is not audible to the human ear. The audible frequency ranges from 20 Hz to 20 kHz. The frequency below 20 Hz is called infrasonic, and the frequency above 20 kHz is called ultrasonic.

The bell jar experiment is a common experiment used to demonstrate that sound needs a medium to travel.

Requirements for this Science Experiment

  • Air-tight glass jar
  • Electric bell
  • Vacuum pump
  • Wires
  • Battery
  • Key

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