Chapter 12: Sound – NCERT Exemplar Solutions for Class 9 Science
This chapter focuses on sound as a form of energy that propagates through vibrations. Students learn how sound is produced by vibrating bodies and how it travels as a longitudinal wave in a medium. The concepts of frequency, amplitude, wavelength, time period, and velocity of sound are explained with diagrams for better understanding.
The chapter also covers the reflection of sound, its applications in echo formation, and the working of devices like SONAR. Characteristics of sound waves such as pitch, loudness, and quality are discussed to show how different sounds are distinguished. The speed of sound in solids, liquids, and gases is also explained with experiments. Another important section deals with the structure of the human ear and how it helps in the perception of sound. This gives students an idea of how physics and biology are interconnected. NCERT Solutions for Class 9 Science provide well-explained answers to textbook exercises, ensuring conceptual clarity. NCERT Exemplar Solutions for Class 9 Science add extra practice questions, including application-based and reasoning problems that test analytical skills. Together, they help students gain a strong grasp of both theoretical and practical aspects of sound.