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How does the sound produced by a vibrati...

How does the sound produced by a vibrating object in a medium reach your ear ?

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When an object vibrates, it sets the particles of the medium around it vibrating. The particles in the medium in contact with the vibrating object displace from its equilibrium position. It then exerts force on the adjacent particles. After displacing the adjacent particle the first particle of medium comes back in its original position. This process continues in the medium till the sound reaches your ear.
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Assertion (A) : The pitch of the sound produced by the vibrating string can be changed. Reason (R) : The pitch of the sound can be changed by changing the length, tension and thickness of the vibrating string.

Knowledge Check

  • The velocity of sound produced by a vibrating body varies -

    A
    directly as the sq . Root of density of the medium
    B
    inversely as the density of the medium
    C
    directly as the sq. root of frequency of the medium
    D
    inversely as the frequency of the medium

  • Assertion (A): The loudness of sound produced by the vibrating body can be increased. Reason (R): The loudness of sound by the vibrating body depends on the amplitude of vibration and also the surface area.

    A
    A and R are true and R is the correct explanation of A.
    B
    A and R are true, but R is not the correct explanation of A.
    C
    A is true but R is false.
    D
    Both A and R are false.

  • Assertion (A) : The pitch of the sound produced by the vibrating string can be changed. Reason (R) : The pitch of the sound can be changed by changing the length, tension and thickness of the vibrating string.

    A
    Both A and R are correct and R is the correct explanation of A.
    B
    Both A and R are correct but R is not the correct explanation of A.
    C
    A is correct and R is incorrect.
    D
    Both A and R are incorrect.
    • NCERT-SOUND -Exercise
    1. How does the sound produced by a vibrating object in a medium reach yo...

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    2. Explain how sound is produced by your school bell ?

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    3. Why are sound waves called mechanical waves ?

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    4. Suppose you and your friend are on the Moon. Will you be able to hear ...

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    5. Which wave property determines (a) loudness (b) Pitch ?

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    6. Guess which has a higher pitch : a guitar or a car horn ?

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    7. What are wavelength, frequency, time period and amplitude of a sound w...

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    8. How are the wavelength and frequency of a sound wave related to its sp...

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    9. Calculate the wavelength of a sound wave whose frequency is 220 Hz and...

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    10. A person is listening to a tone of 500 Hz sitting at a distance of 450...

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    11. Distinguish between loudness and intensity of sound.

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    12. In which of the three media : air, water or iron , does sound travel t...

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    13. An echo is returned in 3 s. What is the distance of the reflecting sur...

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    14. Why are the ceilings of concert halls curved ?

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    15. What is the audible range of the average human ear ?

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    16. What is the range of frequencies associated with (a) infra sound (...

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    17. A submarine emits a sonar pulse, which returns from an underwater clif...

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    18. What is sound and how is it produced ?

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    19. Describe with the help of a diagram, how compressions and rarefactions...

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    20. Cite an experiment to show that sound needs a material for its propaga...

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