Скачать или смотреть Sound - Important Numericals | Class 9 Physics Chapter 11 | CBSE 2025-26

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✅ In this video,

✔️ Class: 9th
✔️ Subject: Physics
✔️ Chapter: Sound (Chapter 11)
✔️ Topic Name: Important Numericals
✔️ Topics Covered In This Video (by Tazmeen Ma'am): In this captivating video, Ma'am guides you through the fascinating curriculum of Class 9 Physics, focusing on the 'Important Numericals' of Chapter 11 - "Sound". Dive deep into the fascinating world of physics as we explore key concepts vital for success in your studies. Join us as we simplify complex topics and make learning fun and engaging for all Class 9 students.
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00:00 Introduction: Sound - Important Numericals
00:22 Important Numericals: (Que.1 & 2) Que.1 - A sound wave has a frequency of 2 kHz and wave length 35 cm. How long will it take to travel 1.5 km?
06:31 Important Numericals: (Que.3 & 4) Que.3 - A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m s.
13:09 Important Numericals: (Que.5 & 6) Que.5 - A sound wave travels at a speed of 339 m s'. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?
17:22 Important Numericals: (Que.7 & 8) Que.7 - A sound wave travels at a speed of 340 m/s. If the wavelength of wave is 1.4 m, what is the frequency of wave?
22:35 Important Numericals: (Que.9 & 10) Que.9 - A cork on the surface of water moves up down completing five vibrations in 4s. The waves travel from a cork to the shore which is 20 m away in 10 s calculate
29:47 Website Overview
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