Question

CHP 9 sound notes class 8 basic science plz..​

Answer 1

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CLASS :- 8TH

SUBJECT :- Science

TOPIC :- Sounds Notes

NOTE:- These are notes of Sound chapter But handwriting is not good Notes are perfect.

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Answer 2

Explanation:

Sound

Sound is a form of energy and it comes from vibrations. These vibrations create sound waves which move through mediums such as air and water before reaching our ears.

Types of Sounds

• Loudness -It distinguishes between loud and feeble sound.

• Pitch -It distinguishes between shriller and flatter sound.

• Timbre or quality -It distinguishes one sound from other having same loudness and pitch.

Sound needs a medium to propagate

The traveling of sound is called propagation of sound. Sound cannot propagate in the absence of a medium.

How is sound produced?

= From loudspeakers to guitars, all sound-producing devices share one common feature: vibration. The amount of vibration, as well as the speed of the vibration, produce the different sounds our ears can recognize.

These are not the full notes.