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Revision Notes

Study of Sound

Maharashtra Board · Class 9 · Science

Quick revision notes for Study of Sound — Maharashtra Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.

45 questions28 flashcards5 concepts

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Key Topics to Revise

1

Nature of Sound and Sound Waves

  • Sound is a form of energy that travels in the form of waves
  • Sound requires a medium for propagation - it cannot travel through vacuum
  • Sound waves are longitudinal waves where particles oscillate parallel to the direction of wave propagation
2

Velocity of Sound

  • Velocity of sound is highest in solids, medium in liquids, and lowest in gases
  • At 25°C: Steel (~6000 m/s), Water (~1500 m/s), Air (346 m/s)
  • Velocity increases with increase in temperature of the medium
3

Audible, Infrasound and Ultrasound

  • Human hearing range: 20 Hz to 20,000 Hz (20 kHz) - called audible sound
  • Infrasound: frequency less than 20 Hz (e.g., earthquake vibrations, pendulum)
  • Ultrasound: frequency greater than 20 kHz
4

Applications of Ultrasound

  • Communication between ships at sea
  • Joining plastic surfaces together
  • Sterilizing liquids like milk by killing bacteria

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Full Notes

Key Concepts

Sound is a form of energySound waves have wavelength (λ)Sound travels at different speedsAudible sound (20 Hz to 20Sound waves follow laws of reflection

Frequently Asked Questions

What are the important topics in Study of Sound for Maharashtra Board Class 9 Science?
Study of Sound covers several key topics that are frequently asked in Maharashtra Board Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Study of Sound — Maharashtra Board Class 9 Science?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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