CBSE Class 9 Science — Sound Waves: Characteristics and Applications
Chapter 10 of the CBSE Class 9 Science syllabus. About 76 minutes of teaching.
Unit: Motion, Force, Work and Sound
Unit weightage: 23 marks
6 topics
What is in this chapter
- 1Production of Sound foundation10 min
- 2Propagation of Sound as a Longitudinal Wave foundation14 min
- 3Characteristics of a Sound Wave16 min
- 4Speed of Sound in Different Media12 min
- 5Human Perception of Sound and Audible Range10 min
- 6Reflection of Sound — Echo and Echolocation14 min
What to know first
No other chapter in this subject is listed as a prerequisite for this one, so you can pick it up without finishing the ones before it.
Where the marks are
CBSE publishes marks by unit, not by chapter. The Motion, Force, Work and Sound unit carries 23 of the 80 marks in the paper, across 4 chapters. Our estimate for this chapter alone is about 5 marks — useful for deciding what to study first, but it is our split of the unit, not an official CBSE per-chapter figure.
This chapter is not on the board yet.
We author chapters one at a time and only publish once the lesson has been checked end to end, so we would rather say "not yet" than ship a thin one. The syllabus above is accurate and free to use meanwhile.
Other chapters in Class 9 Science
Cell: The Building Block of LifeTissues in ActionDescribing Motion Around UsExploring Mixtures and their SeparationHow Forces Affect MotionWork, Energy, and Simple MachinesJourney Inside the AtomAtomic Foundations of MatterReproduction: How Life ContinuesPatterns in Life: Diversity and ClassificationEarth as a System: Energy, Matter, and Life