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Propagation of Sound waves — Flashcards

ICSE · Class 9 · Physics

36 flashcards for Propagation of Sound waves (ICSE Class 9 Physics) to test yourself on key terms and facts. Sample: "What is sound?"

40 questions36 flashcards6 formulas & key relations5 concepts

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A labeled diagram showing a stretched string being plucked, illustrating how its vibrations produce sound. The string should be shown in its resting and vibrating states.
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36 Flashcards·
Sound and vibrationPropagation of soundSound and lightWave types
Card 1Sound and vibration

What is sound?

Answer

Sound is a form of energy that produces the sensation of hearing in our ears.

Card 2Sound and vibration

Why is a vibrating body called a source of sound?

Answer

Sound is produced when a body vibrates and ceases when vibration stops. So a vibrating body is a source of sound.

Card 3Sound and vibration

Describe the tuning fork experiment that shows vibration produces sound.

Answer

A tuning fork is struck and brought near a suspended table tennis ball. The ball jumps to and fro because the fork is vibrating. When the arms stop vibrating, the sound stops too.

Card 4Propagation of sound

Why does sound need a material medium to travel?

Answer

Sound travels by mechanical vibrations of medium particles. The medium must be elastic, have inertia, and be frictionless. Without a medium, sound cannot propagate.

Card 5Propagation of sound

What happens in the bell jar experiment when air is removed?

Answer

The bell still strikes the gong, but the sound becomes weaker and finally cannot be heard. This shows that sound needs a material medium and cannot travel in vacuum.

Card 6Sound and light

Can sound travel in vacuum? Why can light travel in vacuum?

Answer

Sound cannot travel in vacuum because it needs a material medium. Light does not require any material medium and can travel through vacuum.

Card 7Wave types

What is a longitudinal wave?

Answer

A longitudinal wave is a wave in which the particles of the medium vibrate about their mean positions in the direction of propagation of the wave. Sound in air travels as a longitudinal wave.

Card 8Wave types

What happens at compressions and rarefactions in a sound wave?

Answer

At compressions, density and pressure of the medium are maximum. At rarefactions, density and pressure are minimum.

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Frequently Asked Questions

What are the important topics in Propagation of Sound waves for ICSE Class 9 Physics?
Key topics in Propagation of Sound waves include Production of Sound, Sound Needs a Material Medium, Propagation of Sound in a Medium, Basic Wave Terms and Relations. Study these first, then practise questions on each for Class 9 exams.
How many flashcards are available for Propagation of Sound waves?
There are 36 flashcards for Propagation of Sound waves covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Propagation of Sound waves for Class 9 exams?
Learn the core ideas first, then work through the 40 practice questions on Propagation of Sound waves. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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