Sound | Production and Propagation of Sound | Class 9 IX CBSE Science | Toppr Study

Sound | Production and Propagation of Sound | Class 9 IX CBSE Science
Did you know how sound produced? how you can hear the different sounds? what are sound waves? propagation of sound, production of sound, the medium of sound, sound as and energy, etc. important topics are described in this video.
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Introduction of Sound
A sound is a form of energy like heat energy, light energy, potential energy, and kinetic energy. It causes a sensation of hearing in our ears.
Sound cannot be created nor destroyed but can be changed from one form to another. E.g., when we clap, a sound is produced. Here, muscular energy is converted into sound energy. This is in accordance with the law of conservation of energy. Similarly in an electric bell, when connected to electricity starts producing sound. Here, again electrical energy is converted into sound energy.
Production of Sound
Sound is produced due to the vibration of objects. The motion of materials or objects causes vibration. Vibration is a kind of rapid to and fro motion of an object about a central position. It is also referred to as oscillation. For example, a stretched rubber band when plucked vibrates and produces sound.
Propagation of Sound
The traveling of sound is called the propagation of sound waves. The matter or substance through which sound is transmitted is called a medium. The medium can be solid, liquid or gas. Sound cannot travel in a vacuum. A true vacuum refers to the complete absence of matter. Sound waves can travel only through matter.
So, sound needs a physical medium in order to travel anywhere. The wave that requires medium to propagate is called Mechanical Wave. For example - sound waves. Sound cannot travel in the absence of a medium.
All the above-mentioned topics are described in an interactive and efficient manner so that the students could easily understand them.
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• Some facts about sound - 1) Mechanical/Electrical energy is transferred in the form of elastic strain energy of a medium in the form of vibration propagation in continuous medium. 2) As elastic as medium is, the sound propagates with minimum attenuation. This is also supported by the density of the medium. 3) Sound propagation is completely the form of mechanical energy of material medium whether it is solid, liquid or gas which responds to it elastically the disturbances. 4) Higher the frequency of sound is, fast is its propagation speed. It is as quick as continuous to hear or transmit. 5) Loudness or intensity of the sound is its the rate or flux to transfer the acoustic energy on unit area in unit time. Amplitude is the proportional factor. 6) Solids are quick & strong responsible for sound to propagate & reception. Comparatively, Gases are the least to responsive for sound. This is because the proportional effect of the elastic modulus relative to compactness of medium. 7) Temperature is also affecting the propagation of sound. Here, gases are significantly responsive to this effect because of affection on density & pressure in the medium. 8) Sound waves are longitudinal mechanical waves which requires material medium to propagate parallel to the vibration of molecules. They doesn't travel through vacuum. 9) Sound waves or energy is propagating in all directions. This means it propagates the energy in the medium equally irrespective of any directional effect. External intervention is done if it purposely to propagate in desired direction in medium. 10) Acoustic capability of a medium is depends upon the range of frequencies or maximum frequency (Natural) it can handle or sustain to propagate without attenuation or dissipation or structural failure.

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[@AnkitaSingh-tl5mg]

You are very intelligent....I am proud of you....👏👏👌👍