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The NCERT Solutions for Class 9 Science Chapter 12 Sound are provided in this article below. Some of the important concepts of Class 9 Science Chapter 12 Sound are:
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Important Topics for Class 9 Science Chapter 12 Sound
A sound is a vibration that propagates through a medium in the form of a mechanical wave. The medium in which it propagates can either be a solid, a liquid or a gas. Sound travels fastest in solids, relatively slower in liquids and slowest in gases. Sound moves through a medium by alternately expanding and contracting the parts of the medium which it is traveling through.
Diference Between Echo and Reverberation
Echo occurs due to the spontaneous reflection of sound from various surfaces, including walls, furniture, and other similar objects. However, Reverberation porpagates via air due to multiple reflections of sound waves from different surfaces like walls, furniture and more.’
| Example: The formation of_______ is found to occur when the reflecting surface is 17m.
Solution: Option 1 is the correct answer as because echoes are known to cause when certain reflecting surfaces are at a distance greater than 17m and more. |
Structure of Human Ear
Human ear is known to include three parts, namely the outer ear, middle ear and inner ear. Ideally, the ear canal situated upon the outer ear is found separated from the tympanic cavity located in the middle ear by the eardrum.
| Example: Highlight the function of hearing. Solution: Hearing is the basic function of the human ear. It basically works towards identiffying and interpreting sounds in our surroundings. The ears further helps to send electrical signals to the brain, assisting the brain to perceive and comprehend the sound. The sequential process of identifying, analysing and decoding sound waves is known as hearing. |
Sonar
Sonar is an abbreviation of “Sound Navigation and Ranging.” Sonar is basically a navigation system which identifies and uses acoustic signals to recognize distant underwater communications.
| Sonar technologies can be further classified into two segments:
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| Important Science Study Guides | ||
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| Physics Constants | Difference between in chemistry | Difference between in biology |
| Named Reactions | Difference between in physics | Periodic Table |
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