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Lesson 9 important questions of NCERT science 9th class
Lesson 9 of 9 • 7 upvotes • 12:45mins
Kavita Shukla
Lesson 9 important questions of 9th class NCERT science: questions of physics and environmental science
(Hindi) Sound: Class 9
9 lessons • 1h 26m
1
Overview (in Hindi)
1:47mins
2
Lesson 2 Sound, Production of Sound, Propagation of Sound (in Hindi)
8:59mins
3
Lesson 3 Sound Needs a Medium, Sound Waves Are Longitudinal (in Hindi)
11:10mins
4
Lesson 4 Characteristics of Sound (in Hindi)
14:07mins
5
Lesson 5, Intensity of Sound, Reflection of Sound, Echo (in Hindi)
10:33mins
6
Lesson 6, Uses of Multiple Reflection of Sound, Range of Hearing (in Hindi)
7:18mins
7
Lesson 7, Applications of Ultrasound, Sonar (in Hindi)
10:36mins
8
Lesson 8 important questions for 9th class
8:43mins
9
Lesson 9 important questions of NCERT science 9th class
12:45mins
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