CBSE Class 9 Science Sound Notes

CBSE Class 9 Science Sound Notes. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

Sound

Sound is a mechanical wave and needs a material medium like air, water, steel etc. for its propagation.

A medium is the substance or material through which a pulse or a wave moves.

INTEXT QUESTIONS 

1. How does the sound produced by a vibrating object in a medium reach your ear?

Ans: When an object vibrates, it forces the neighbouring particles of the medium to vibrate. These vibrating particles then force the particles adjacent to them to vibrate. In this way, vibrations produced by an object are transferred from one particle to another till it reaches the ear.

LONGITUDINAL AND TRANSVERSE WAVE

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A longitudinal wave is a wave where the particles in the medium move parallel to the direction of propagation of the wave.

“If the particles of a medium vibrate in a direction, parallel to or along the direction of propagation of wave, it is called longitudinal wave”

Sound waves are pressure waves caused by objects which are vibrating. Sound waves need a medium through which to travel.

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A compression is a region in a longitudinal wave where the particles are closest together. A rarefaction is a region in a longitudinal wave where the particles are furthest apart.

Please click the link below to download CBSE Class 9 Science Sound Notes.

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