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👉Previous Video: • Characteristics of Sound - Sound | Class 9... 👉Next Video: • Sound - NCERT Solutions | Class 9 Physics ... ======================================================= ✔️📚👉 Watch Full Free Course Videos: https://www.magnetbrains.com ✔️📚👉 Grab E-book & E-Notes by Expert Teachers Here: https://www.magnetbrains.com/notes ======================================================= 📢 Full Playlist Link: • Class 9 Science (Tazmeen Ma'am) | Complete... ✅ 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. ======================================================= 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 ======================================================= Why study from Magnet Brains? Magnet Brains is an online education platform that helps to gives you NCERT/CBSE curriculum-based full courses free from Kindergarten to Class 12th so that you can perform well in any and all exams you give in your academic career. 👉 Contact us 🤑🤑 ➡️ Connect with us: [email protected] ➡️ Website: https://www.magnetbrains.com/ ➡️ Subscribe to us on YouTube: / @magnetbrainseducation ➡️ Subscribe to Magnet Brains Hindi Medium: / @magnetbrainshindimedium ➡️ Facebook:- https://www.magnetbrains.com/out/face... ➡️ Instagram:- https://www.magnetbrains.com/out/inst... #class9th #physics #ncert #science #newsession2024_25 #magnetbrains #chapter11 #physicsclass9th #class9 #cbse2024_25 #sound #soundclass9 #questionanswer #importantnumerical #numericals sound important numericals class 9 science sound numericals class 9 with solutions sound numericals class 9 numericals on sound class 9 sound class 9 numericals formulas sound class 9 important questions with answers class 9 science chapter 11 exercise question answer class 9 science chapter sound exercise question answer sound questions answers class 9 science sound questions answers class 9 science chapter 11 Disclaimer: "This video is for educational and informational purposes only and is not intended to infringe on any copyrights. If you believe that this video has used any copyrighted material in a way that constitutes copyright infringement, please contact us at [email protected] and we will take appropriate action."