Chapter 5 • Class 9 Physics
Sound
Free Class 9 Physics Sound chapter: longitudinal waves, compressions & rarefactions, wavelength, frequency, pitch, loudness, echo, reverberation and SONAR — with solved numericals, MCQ tests and assignments.
Study by topic — one focused page each
1
Nature & Propagation of Sound
What is sound? Sound is a form of energy that our ears detect as hearing. It is produced by vibrating objects — a plucked guitar string, the stretched…
Start this topic → 2Characteristics of a Sound Wave
A sound wave can be described completely by a small set of measurable quantities. Although sound is longitudinal, it is convenient to draw it as a gra…
Start this topic → 3Reflection of Sound, Echo & Applications
Sound bounces back when it strikes a hard surface, just as a ball rebounds off a wall. This bouncing back is the reflection of sound , and it underlie…
Start this topic →Chapter-wide tests
Online Test
20 MCQ • 15 min
IMO / Olympiad Practice
Olympiad level • 15 min
📝 Full Chapter Test (Download & Print)
40 marks • 90 min • with answer key