![]() As the wave moves, the air particles which are in contact with the vibrating source are first displaced from their equilibrium position, exert a force on the neighbours causing them to be displaced from their equilibrium position and come back to their original position. A vibrating source produces sound waves in the surrounding medium. Sound is emitted by the vibrating source. Therefore, longitudinal waves can be propagated through all of them. All the media, solids, liquids and gases possess these properties. Medium should possess the inertia or mass to store the kinetic energy.ĭue to these properties, medium can offer an opposition to change in volume.Medium should be elastic to store the potential energy.Particles of the medium do not travel during the propagation of the wave from one point to another.Ĭharacteristics of the Medium for the Propagation of the Wave.There is no transfer of the matter through the medium.Only energy is transported from one point to another point in a medium.Only the disturbance created by the source in a medium travels through the medium.low pressure regions are called rarefactions. Rarefaction: The regions where the particles of the medium are farther apart from each other, i.e. high pressure regions are called compressions. These involve changes in volume and density of the medium.Ĭompression: The regions where the particles of the medium become closer during vibration, i.e. As a result compression and rarefaction regions are formed. Sound waves are the longitudinal waves because the vibration of the particle in a medium is parallel to the direction of propagation of the wave. The continuous disturbance which travels through a medium, transporting the energy from one point of the medium (i.e., the point where the disturbance is created) to the other point without being shifted the material is called a wave. You can also Download Class 9 Science Notes PDF to help you to revise complete Syllabus and score more marks in your examinations. a medium transports the mechanical energy created by the vibrating particle from one point to another without shifting the material particles of the medium.įor human beings, the range of hearing is limited to frequencies 20Hz to 20kHz, whereas a dog can perceive vibration higher than 20 kHz, i.e. The important experience in our everyday life is the sensory experience, for this we are equipped with ears for the detection of sound.īasically, all types of sounds which we experience are created by vibrating objects and propagate through a material medium as a wave, i.e. CBSE Class 9 Science Practical Skills – Sound
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