Study Chapter Details
UP Board Class 9 Science Book – Sound
The “Sound” chapter from the UP Board Class 9 Science Book introduces students to one of the most fascinating topics in physics — the study of how sound is produced, propagated, and heard. Based on the latest NCERT syllabus, this chapter explains that sound is a form of energy that travels in the form of vibrations through a medium such as air, water, or solids.
Students learn about production of sound, characteristics of sound waves like frequency, amplitude, and wavelength, and the difference between musical and noise sounds. The chapter also discusses speed of sound in different media, reflection of sound, and practical applications such as echoes and SONAR.
Illustrations, activities, and experiments help students understand how sound waves behave in real life — from speaking and hearing to technological uses like sonar navigation.
The UP Board Class 9 Science Book – Sound provides easy explanations, formulas, and solved examples to enhance conceptual clarity and strengthen exam preparation. It builds a strong foundation for higher-level physics and helps students connect scientific concepts with everyday experiences.
