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Sound Class 8 PPT
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Page 1
CHAPTER - 13
SOUND
Page 2
CHAPTER - 13
SOUND
Musical instruments
Page 3
CHAPTER - 13
SOUND
Musical instruments 1) Sound :-
Sound plays an important part in our daily lives. It helps us to
communicate with each other. We hear a wide variety of sounds in our
surroundings.
Sound is produced by a vibrating body. Vibration is the to and fro or
back and forth motion of an object.
Eg :- If you strike a school bell, it vibrates and produces sound.
If you pluck a stretched rubber band, it vibrates and produces
sound.
If you beat a drum, its stretched membrane vibrates and produces
sound.
If you blow a bugle, the air column vibrates and produces sound.
Page 4
CHAPTER - 13
SOUND
Musical instruments 1) Sound :-
Sound plays an important part in our daily lives. It helps us to
communicate with each other. We hear a wide variety of sounds in our
surroundings.
Sound is produced by a vibrating body. Vibration is the to and fro or
back and forth motion of an object.
Eg :- If you strike a school bell, it vibrates and produces sound.
If you pluck a stretched rubber band, it vibrates and produces
sound.
If you beat a drum, its stretched membrane vibrates and produces
sound.
If you blow a bugle, the air column vibrates and produces sound.
2) Musical instruments and their vibrating parts :-
Sl.No. Musical
instrument
Vibrating part producing sound
1 Veena Stretched string
2 Sitar Stretched string
3 Violin Stretched string
4 Tabala Stretched membrane
5 Mridangam Stretched membrane
6 Drum Stretched membrane
7 Shehnai Air column
8 Flute Air column
9 Mouth organ Air column
Page 5
CHAPTER - 13
SOUND
Musical instruments 1) Sound :-
Sound plays an important part in our daily lives. It helps us to
communicate with each other. We hear a wide variety of sounds in our
surroundings.
Sound is produced by a vibrating body. Vibration is the to and fro or
back and forth motion of an object.
Eg :- If you strike a school bell, it vibrates and produces sound.
If you pluck a stretched rubber band, it vibrates and produces
sound.
If you beat a drum, its stretched membrane vibrates and produces
sound.
If you blow a bugle, the air column vibrates and produces sound.
2) Musical instruments and their vibrating parts :-
Sl.No. Musical
instrument
Vibrating part producing sound
1 Veena Stretched string
2 Sitar Stretched string
3 Violin Stretched string
4 Tabala Stretched membrane
5 Mridangam Stretched membrane
6 Drum Stretched membrane
7 Shehnai Air column
8 Flute Air column
9 Mouth organ Air column
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FAQs on Sound Class 8 PPT
| 1. What is sound and how is it produced? |  |
Ans. Sound is a form of energy that is produced when an object vibrates. These vibrations create waves that travel through a medium such as air or water and are detected by our ears. Sound can be produced by various sources, such as musical instruments, human voice, animals, machines, etc.
| 2. What are the properties of sound waves? | |
Ans. Sound waves have three main properties: frequency, amplitude, and wavelength. The frequency of a sound wave determines its pitch, which is the highness or lowness of the sound. The amplitude of a sound wave determines its loudness, which is the intensity of the sound. The wavelength of a sound wave determines the distance between two consecutive points in a wave cycle.
| 3. How does sound travel through different mediums? | |
Ans. Sound can travel through different mediums such as air, water, and solids. In air, sound waves travel as longitudinal waves, where the molecules of air vibrate in the same direction as the wave. In water and solids, sound waves can travel as both longitudinal and transverse waves. The speed of sound waves also varies depending on the medium it travels through.
| 4. What is an echo and how is it produced? | |
Ans. An echo is a sound wave that bounces back after hitting a surface and returns to the listener's ear. It is produced when the original sound wave reflects off a hard surface such as a wall, mountain, or building, and travels back towards the listener. The distance between the listener and the reflecting surface determines the time delay between the original sound wave and the echo.
| 5. How do we measure the loudness of sound? | |
Ans. Loudness is measured in decibels (dB). The human ear can detect sounds ranging from 0 dB (threshold of hearing) to 140 dB (painful). The sound level meter is used to measure the loudness of sound, which calculates the intensity of sound in dB. The loudness of sound can also be affected by factors such as distance from the source, the environment, and the frequency of the sound wave.
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