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Give a brief summary of Ch …

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Give a brief summary of Ch Sound

Posted by Manya ? 4 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Shreya Jha 4 years, 6 months ago

Ch Sound in class 8 talks about sound is produced by vibration and in humans by larynx the vocal cords vibrates and sound is produced. Then next sound needs medium to propagate or move that is liquid, solid, gas. It propagate fastest in solids and slowest in gases and cannot propagate or move in vaccum. Then it talks about infrasonic and ultrasonic waves. That infrasonic Waves are less than 20Hertz and ultrasonic waves are more than 20,000 Hertz. Human ear can hear through 20Hertz-20,000 Hertz.The stricture of Human ear consists of outer ear pinna , middle ear stirrup, hammer, anvil (three bones of ear) , inner ear cochlea.

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