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FAQs on PPT: Chapter 12 - Sound, Class 9, Science

1. What is sound and how is it produced?
Ans. Sound is a form of energy that is produced by vibrating objects. It is generated when an object vibrates and creates sound waves that travel through a medium, such as air or water. These sound waves then reach our ears, where they are detected and interpreted as sound.
2. How does sound travel through different mediums?
Ans. Sound waves require a medium to travel through. In solids, sound travels fastest because the particles are closely packed and can easily transmit the vibrations. In liquids, sound travels at a slower speed as the particles are loosely packed. In gases, sound travels slowest as the particles are far apart and offer more resistance to the transmission of sound waves.
3. What is the difference between pitch and loudness of sound?
Ans. Pitch refers to the frequency of sound waves and determines how high or low a sound is. A high pitch sound has a high frequency, while a low pitch sound has a low frequency. Loudness, on the other hand, refers to the intensity or amplitude of sound waves and determines how soft or loud a sound is. A sound with a higher amplitude is louder, while a sound with a lower amplitude is softer.
4. How does sound travel in our ears and how do we hear it?
Ans. When sound waves reach our ears, they enter through the ear canal and reach the eardrum. The eardrum vibrates in response to these sound waves, and these vibrations are then transmitted to three small bones in the middle ear called the hammer, anvil, and stirrup. The vibrations of these bones amplify the sound and send it to the inner ear, where it is converted into electrical signals by the cochlea. These electrical signals are then sent to the brain through the auditory nerve, and we perceive them as sound.
5. Can sound travel in a vacuum?
Ans. No, sound cannot travel in a vacuum. Sound waves require a medium, such as air, water, or solids, to travel through. In a vacuum, where there is no air or any other medium, sound waves have no particles to vibrate and transmit the sound. Therefore, sound cannot be heard in space, where there is a vacuum.
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