Production of Sound


•    The to and fro motion in which the body assumes a new shape during its motion, is called vibratory motion.
•    Sound is a form of energy that produces the sensation of hearing in our ears. Sound is produced when a body vibrates. In other words each source of sound is a vibrating body.
•    In wind instruments such as flute, clarinet etc., the pitch of sound is changed by changing the length of the vibrating column. As the length of the vibrating column decreases, the pitch of the sound increases.

                                            

•    In stringed instruments such as violin, sitar, piano etc., the pitch of sound is changed either by changing the place of plucking or by changing the tension of the string. For this, several strings are provided in such instruments which are stretched at different tensions.

                                  

•    Tuning fork produces sound when its prong is struck gently to a rubber pad. Vocal cords of human produce sound.

 

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  • Q1

    What is sound?

    Marks:1
    Answer:

    Sound is a form of energy producing sensation of hearing.

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  • Q2

    Explain how sound is produced by each of the following types of musical instruments.

    (i) Wind instruments.

    (ii) Stringed instruments.

    (iii) Percussion instruments.

    Marks:3
    Answer:

    (i) In wind instruments, sound is produced by vibrating a air column inside these instruments. Example: Flute, shehnai, etc.
    (ii) In stringed instruments, sound is produced when taut strings vibrate to and fro on plucking. Example: Sitar, guitar, etc .

    (iii) In percussion instruments, sound is produced when stretched skin vibrates. Example: tabla, drum, etc.

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  • Q3

    What do you understand by the terms compression and rarefaction?

    Marks:2
    Answer:

    The high-pressure region, created by a vibrating object as it moves forward, and pushes and compresses the air in front of it, is called a compression (C). This compression starts to move away from the vibrating object.
    When the vibrating object moves backwards, it creates a region of low pressure called rarefaction (R).

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  • Q4

    How sound is produced by the human beings?

    Marks:1
    Answer:

    Human beings have two vocal cords stretched across voice-box in their throats. When their lungs force air through them, they vibrate and produce sound.

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  • Q5

    How is sound produced?

    Marks:1
    Answer:

    Sound is produced by vibration of the objects.

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