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Topic 01
propagation of sound
Ms. Jyoti Sharma
Topic 03
Characteristics of sound
Ms. Jyoti Sharma
Topic 05
echo and SONAR
Ms. Jyoti Sharma
Topic 02
Sound need medium to travel
Ms. Jyoti Sharma
Topic 04
reflection of sound
Ms. Jyoti Sharma
Topic 06
Structure of the Human Ear
Ms. Jyoti Sharma
Class 9 Science
Chapter 12
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