SOUND, CBSE CLASS IX, PHYSICS NOTES PART I
CBSE CLASS IX, SOUND, SCIENCE (PHYSICS) NOTES- (PART I) SOUND According to the CBSE Syllabus 2025-26 Topics in the Chapter 1. Introduction 2. Production of Sound 3. Propagation of Sound 4. Sound waves are Longitudinal waves 5. Characteristics of a Sound Wave 6. Wavelength 7. Frequency 8. Time Period 9. Amplitude a. Pitch b. Loudness c. Quality or Timbre 10. Velocity 11. Speed of sound in various medium 12. Sonic Boom 13. Reflection of Sound 14. Echo 15. Reverberation 16. Range of Hearing 17. Hearing Aid 18. Application of Ultrasound 19. SONAR 20. Structure of Human Ear a. Working of Human Ear INTRODUCTION The sensation felt by our ears is called sound. Sound is a form of energy that makes us hear. The law of conservation of energy is also applicable to sound. Sound travels in the form of a wave. PRODUCTION OF SOUND I. Sound is produced...