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Sound — Flashcards

ICSE · Class 8 · Physics

34 flashcards for Sound (ICSE Class 8 Physics) to test yourself on key terms and facts. Sample: "What is sound?" Part of the ICSE Class 8 Physics syllabus.

166 questions34 flashcards5 formulas & key relations5 concepts

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34 Flashcards·
Introduction to soundSource of soundMedium for soundSpeed of soundType of waveCompression and rarefactionFrequency and time periodNumerical on frequency
Card 1Introduction to sound

What is sound?

Answer

Sound is a form of energy that produces a sensation of hearing. It is produced when a body vibrates.

Card 2Source of sound

Why is a vibrating body called a source of sound?

Answer

A vibrating body produces sound. Thus, each source of sound is a vibrating body. For example, a plucked string starts vibrating and produces sound.

Card 3Medium for sound

Why can two persons not hear each other on the moon?

Answer

Sound needs a medium for its propagation. It cannot travel in vacuum. The moon has no atmosphere, so sound cannot travel there.

Card 4Speed of sound

Which travels faster: sound in iron, water, or air?

Answer

Sound travels fastest in iron, then in water, and slowest in air. Speed of sound: - Iron = nearly 5000 m/s - Water = nearly 1500 m/s - Air = nearly 330 m/s…

Card 5Type of wave

What is a longitudinal wave in sound?

Answer

"This wave in which the particles of the medium vibrate about their mean positions, in the direction of propagation of sound, is called longitudinal wave." Sound in air travels as a longitudinal wave.

Card 6Compression and rarefaction

What forms one complete wave in sound propagation?

Answer

One complete to and fro motion of the strip forms one compression and one rarefaction. Together, they constitute one wave.

Card 7Frequency and time period

State the relation between frequency and time period.

Answer

Formula: f = 1/T Meaning: - f = frequency - T = time period Units: - f in hertz or s^-1 - T in second Quick example: If T = 2 s, then f = 1/2 = 0.5 Hz.

Card 8Numerical on frequency

A wave has time period 4 s. Find its frequency.

Answer

Given: - Time period, T = 4 s Formula: - f = 1/T Solution: - f = 1/4 s - f = 0.25 s^-1 - f = 0.25 Hz Answer: 0.25 Hz…

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Frequently Asked Questions

What are the important topics in Sound for ICSE Class 8 Physics?
Key topics in Sound include Sound as Energy and Its Propagation, Wave Terms and Relations, Loudness and Amplitude, Decibel Scale and Safe Sound Levels. Study these first, then practise questions on each for Class 8 exams.
How many flashcards are available for Sound?
There are 34 flashcards for Sound covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Sound for Class 8 exams?
Learn the core ideas first, then work through the 166 practice questions on Sound. 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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