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Syllabus

Acoustics — Syllabus

Tamil Nadu Board · Class 10 · Science

What Acoustics covers in Tamil Nadu Board Class 10 Science: 4 topics, for the 2026-27 session. Part of the Tamil Nadu Board Class 10 Science syllabus.

45 questions32 flashcards2 formulas & key relations5 concepts

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4 Topics · Tamil Nadu Board Class 10 Science · 2026-27

Topics in Acoustics

1

Sound Waves – Nature and Types

  • Sound is produced by the vibration of bodies and travels in the form of longitudinal waves.
  • Sound requires a material medium (solid, liquid, or gas) to propagate — it CANNOT travel in vacuum.
  • In longitudinal waves, particles vibrate along the direction of wave propagation, forming compressions (high pressure) and rarefactions (low pressure).
2

Factors Affecting Velocity of Sound

  • In gases, three main factors affect the speed of sound: density, temperature, and humidity.
  • Effect of density: Speed is inversely proportional to the square root of density — v ∝ 1/√d. Denser gas = slower sound.
  • Effect of temperature: Speed is directly proportional to the square root of absolute temperature — v ∝ √T. Hotter gas = faster sound.
3

Reflection of Sound

  • When sound waves strike the surface of another medium, they bounce back — this is called reflection of sound.
  • The incident wave is the one that strikes the surface; the reflected wave is the one that bounces back.
  • Sound obeys the same two laws of reflection as light.
4

Echo – Conditions, Applications and Speed Measurement

  • An echo is the sound heard after reflection of the original sound from a rigid surface (wall, mountain, ceiling, etc.).
  • The persistence of human hearing is 0.1 second — the ear cannot distinguish two sounds if they arrive within 0.1 s of each other.
  • For an echo to be heard, the time gap between original sound and echo must be at least 0.1 s.

Key Concepts

Sound is produced by vibrationsThe velocity (speed) of a soundSound travels at different speeds dependingThree main factors affect sound velocitySound waves are classified into three

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Frequently Asked Questions

What are the important topics in Acoustics for Tamil Nadu Board Class 10 Science?
Key topics in Acoustics include Sound Waves – Nature and Types, Factors Affecting Velocity of Sound, Reflection of Sound, Echo – Conditions, Applications and Speed Measurement. Study these first, then practise questions on each for the Tamil Nadu Board Class 10 board exam.
How should I revise Acoustics for the Tamil Nadu Board Class 10 board exam?
Learn the core ideas first, then work through the 45 practice questions on Acoustics. 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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All Tamil Nadu Board Class 10 Science Syllabus

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