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Solutions 13. Sound - Chapter Review | Class 8 Science - Toppers Study

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Solutions 13. Sound - Chapter Review | Class 8 Science - Toppers Study

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Chapter 13 Science class 8

Chapter Review class 8 Science Chapter 13. Sound

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Solutions 13. Sound - Chapter Review | Class 8 Science - Toppers Study
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Chapter 13. Sound Chapter Review Class 8

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13. Sound

| Chapter Review |

Solutions 13. Sound - Chapter Review | Class 8 Science - Toppers Study

Chapter Review:

When an object vibrates, it produces sound.
When any sound reflects by striking on any medium, that sound heard us again and again. This is called eco sound.
The audible range of human ears is 20 Hz to 20,000 Hz.
The S.I unit of frequency is Hz (Hertz).
The S.I unit of wave length is meter.
The to and fro or back and forth motion of an object is termed as vibration.
In humans, the sound is produced by the voice box or the larynx.
The vocal cords in men are about 20mm long. In women these are about 5mm shorter.
When air has been removed completely from a vessel, it is said that there is vacuum in the vessel.
When sound enters in it, it travels down a canal at the end of
which a thin membrane is stretched tightly. It is called the eardrum.
The to and fro motion of an object is known as vibration. This motion is also called oscillatory motion.
The number of oscillations per second is called the frequency of oscillation.
The loudness of sound depends on its amplitude. When the amplitude of vibration is large, the sound produced is loud. When the amplitude is small, the sound produced is feeble.
The loudness is expressed in a unit called decibel (dB).
Unpleasant sounds are called noise.
Some animals can hear sounds of frequencies higher than 20,000 Hz.
Dogs have this ability.
Sound travels through a medium (gas, liquid or solid). It cannot travel in vacuum.

Other Pages of this Chapter: 13. Sound

1. Chapter 13. Sound | Chapter Review

2. Chapter 13. Sound | Text Book Exercise

3. Chapter 13. Sound | Text Book Exercise

4. Chapter 13. Sound | Additional Questions With Solutions

5. Chapter 13. Sound | Additional Questions With Solutions

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