IB Board Grade 9 Physics | Module 4: Waves (Light and Sound) by Prakhar Chauhan | Learn Smarter
K12 Students

Academics

AI-Powered learning for Grades 8–12, aligned with major Indian and international curricula.

Academics

Grades

Grade 8 Grade 9 Grade 10 Grade 11 Grade 12

Curriculum

CBSE ICSE IB
Professionals

Professional Courses

Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.

Professional Courses
Games

Interactive Games

Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.

games
Typing
Memory
Math
English Adventures
Knowledge
Module 4: Waves (Light and Sound)

Waves play a critical role in energy transfer across various mediums, with sound and light being key examples. Understanding the fundamental properties, types, and behaviors of waves—including concepts like amplitude, wavelength, and frequency—helps clarify how they interact with the world around us. Additionally, the chapter examines sound and light phenomena, their characteristics, and applications in real life.

Enroll to start learning

You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take mock test.

Sections

  • 1

    General Wave Properties – The Foundation Of Wave Phenomena

    This section introduces the fundamental properties of waves, including their definitions, classifications, and key characteristics.

    Learning Practice

  • 1.1

    Definition Of A Wave: A Disturbance In Motion

    A wave is a disturbance that transfers energy through a medium or space, without permanently moving the medium itself.

    Learning Practice

  • 1.2

    Transverse Vs. Longitudinal Waves: Understanding Particle Motion

    This section examines two fundamental types of waves, transverse and longitudinal, based on the motion of particles in relation to energy transfer.

    Learning Practice

  • 1.3

    Key Wave Characteristics: Quantifying Wave Motion

    This section discusses the essential parameters used to quantify wave motion, including amplitude, wavelength, frequency, period, and wave speed.

    Learning Practice

  • 1.4

    Wave Phenomena: The Interactions Of Waves

    This section explores the interactions of waves including reflection, refraction, and diffraction.

    Learning Practice

  • 2

    Sound Waves – The Vibrations We Hear

    This section explores the nature of sound waves, explaining their mechanism of propagation, speed, characteristics, and practical applications.

    Learning Practice

  • 2.1

    Nature Of Sound: The Mechanics Of Hearing

    This section explores the nature of sound, including how it is produced, how it propagates through different mediums, and how we perceive sound.

    Learning Practice

  • 2.2

    Speed Of Sound: How Fast Does It Travel?

    The speed of sound varies based on the medium it travels through, being fastest in solids and slowest in gases.

    Learning Practice

  • 2.3

    Characteristics Of Sound: Our Perception Of Waves

    This section covers how the physical properties of sound waves determine our perception of pitch, loudness, and quality.

    Learning Practice

  • 2.4

    Echoes And Their Practical Applications

    Echoes are reflected sound waves that have practical applications in various fields, including sonar and medical imaging.

    Learning Practice

  • 3

    Light Waves – Our Window To The Universe

    This section explores the properties of light as an electromagnetic wave, including its nature, the electromagnetic spectrum, reflection, refraction, and lens operation.

    Learning Practice

  • 3.1

    Nature Of Light: The Electromagnetic Phenomenon

    Light is a transverse electromagnetic wave that propagates through space without the need for a medium.

    Learning Practice

  • 3.2

    The Electromagnetic Spectrum: Beyond Visible Light

    The electromagnetic spectrum encompasses a range of electromagnetic waves, of which visible light is just a small part, with varying wavelengths, frequencies, and applications.

    Learning Practice

  • 3.3

    Reflection Of Light: The Bouncing Back

    This section covers the phenomenon of reflection of light, explaining the laws that govern it and the properties of images formed by plane mirrors.

    Learning Practice

  • 3.4

    Refraction Of Light: The Bending Path

    Refraction is the bending of light as it passes from one medium to another due to a change in its speed.

    Learning Practice

  • 3.5

    Lenses: Shaping Light Through Refraction (Qualitative)

    This section explores how lenses utilize the principle of refraction to shape and manipulate light, forming images through converging and diverging effects.

    Learning Practice

  • 4

    Skills Developed In Module 4

    This section outlines the scientific inquiry and analytical skills developed through Module 4, focusing on wave properties.

    Learning Practice

  • 5

    Assessments In Module 4

    Assessments in this module evaluate students' comprehension of wave properties, sound, and light through practical investigations and problem-solving assignments.

    Learning Practice

References

Untitled document (12).pdf

Class Notes

Memorization

What we have learnt

  • Waves transfer energy witho...
  • Sound waves require a mediu...
  • The behavior and properties...

Final Test

Revision Tests