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Production of Sound

Sound is produced when an object vibrates and sets the surrounding medium into vibration.

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Student-friendly explanation

A vibrating object moves to and fro very rapidly. This motion pushes and pulls nearby air particles, creating disturbances that our ears can detect as sound. A tuning fork, drum skin, stretched rubber band, and vocal cords all produce sound because some part of them vibrates.

How to write this in exams

  1. 1

    Start with the exact idea

    Sound is produced when an object vibrates and sets the surrounding medium into vibration.

  2. 2

    Then show how to use it

    Identify the object producing sound. Find the part that vibrates. State that vibration disturbs air particles. Connect this disturbance to hearing sound.

  3. 3

    Add one concrete example

    When a struck tuning fork is touched to water, the water splashes because the prongs are vibrating rapidly.

  4. 4

    Avoid this incomplete answer

    Wrong answer: Sound is produced because the object moves from one place to another. This is wrong because vibration is repeated to-and-fro motion about a mean position, not overall displacement.

Definition

Sound is produced when an object vibrates and sets the surrounding medium into vibration.

Example

When a struck tuning fork is touched to water, the water splashes because the prongs are vibrating rapidly.

Rule to remember

Rule: A vibrating body is necessary for production of sound. Greater vibration energy generally gives louder sound, but the basic cause remains vibration.

Memory hook

No vibration, no sound.

Examples and method

Worked example

A student strikes a tuning fork and then holds it near the ear. Sound is heard because the fork's prongs vibrate and transfer disturbance to air particles. When the prongs stop vibrating, sound also stops.

Method to apply

Identify the object producing sound. Find the part that vibrates. State that vibration disturbs air particles. Connect this disturbance to hearing sound.

Diagram support

Show a tuning fork with prongs moving inward and outward, and label vibrating prongs and surrounding air disturbance.

How CBSE asks it

Questions usually ask students to identify the vibrating part in a musical instrument or explain a demonstration with a tuning fork, rubber band, or drum.

Avoid common mistakes

Common confusion

Students often say sound is produced by force alone. Force may start the vibration, but continuous vibration is the immediate cause of sound.

Common wrong answer

Wrong answer: Sound is produced because the object moves from one place to another. This is wrong because vibration is repeated to-and-fro motion about a mean position, not overall displacement.

Exam tip

In observation-based answers, always mention the vibrating part, such as prongs of tuning fork, drum membrane, or vocal cords.

Quick check

Why does a stretched rubber band produce sound when it is plucked?

A stretched rubber band produces sound because it vibrates rapidly after being plucked and makes the surrounding air particles vibrate.

Study the production of sound diagram carefully

Use the labelled diagram to keep production of sound clear in short answers and revision.

What this diagram makes clear

This diagram keeps the labels and direction of production of sound in the right order.

Where this helps in exams

Use this for labelled diagram work and short exam answers on production of sound.

Revision cue

Revise production of sound through the labels before writing the answer.

Answer writing and exam use

1-mark answer

Sound is produced when an object vibrates and sets the surrounding medium into vibration.

2-mark answer

Sound is produced when an object vibrates and sets the surrounding medium into vibration. Rule: A vibrating body is necessary for production of sound. Greater vibration energy generally gives louder sound, but the basic cause remains vibration. When a struck tuning fork is touched to water, the water splashes because the prongs are vibrating rapidly.

3-mark answer

A vibrating object moves to and fro very rapidly. This motion pushes and pulls nearby air particles, creating disturbances that our ears can detect as sound. A tuning fork, drum skin, stretched rubber band, and vocal cords all produce sound because some part of them vibrates. Rule: A vibrating body is necessary for production of sound. Greater vibration energy generally gives louder sound, but the basic cause remains vibration. A student strikes a tuning fork and then holds it near the ear. Sound is heard because the fork's prongs vibrate and transfer disturbance to air particles. When the prongs stop vibrating, sound also stops. Questions usually ask students to identify the vibrating part in a musical instrument or explain a demonstration with a tuning fork, rubber band, or drum. Wrong answer: Sound is produced because the object moves from one place to another. This is wrong because vibration is repeated to-and-fro motion about a mean position, not overall displacement.
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