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👉Previous Video: • Characteristics of Sound (Wavelength and V... 👉Next Video: • What is Reverberation? - Sound | Class 9 P... ✔️📚👉 Watch Full Free Course: https://www.magnetbrains.com ✔️📚👉 Get Any Class & Subject's Topic Video Here:- https://www.magnetbrains.com/get-topi... ✔️📚👉 Get All Subjects Playlists: https://www.pabbly.com/out/all-videos... ✔️📚👉 Grab Notes by Expert Teachers Here: https://www.pabbly.com/out/magnet-brains ✔️📚👉 Place Your Queries For Books Here: https://www.magnetbrains.com/booklet ✔️📚👉 Get Books Prepared by Our Expert Teachers at Your Door Step: https://www.magnetbrains.com/book_pur... =============================================== 📢 Full Playlist Link: • Class 9 Physics (New Session 2023-24) | Co... ✅ In this video, ✔️ Class: 9 ✔️ Subject: Physics ✔️ Chapter: Sound ✔️ Topic Name: Reflection of Sound (Echo) =============================================== 00:00 Introduction: Sound 00:06 Reflection of Sound 14:23 Echo 24:45 Website Overview =============================================== 📢 🔥 Available (Kindergarten to 12th) all Video Subject wise Playlist https://www.pabbly.com/out/all-videos... Why study from Magnet Brains? Magnet Brains is an online education platform that helps give You NCERT/CBSE curriculum based free full courses 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 : / magnet-brains-education-110955641184512 ➡️ Instagram : / magnetbrains ➡️ Telegram : https://t.me/magnetbrainsbhopal Points covered in this video:- Reflection of Sound Bouncing of sound from a material surface (hard surface) is known as reflection of sound. When the sound waves produced from a source falls on any other object and reflects back. Laws of reflection of light is equivalent to law of reflection of sound. The incident sound wave, the reflected sound wave, and the normal at the point of incidence, all lie same plane. The angle of reflection of sound is always equal to the angle of incidence of sound. Whatever we speak, it persists in our brain for 0.1 second. You can hear whatever you speak. Echo The repetition of sound caused by the reflection of sound waves is called echo. The minimum time interval should be 0.1 second to hear an echo. Formula for echo S = 2D/t Distance between source and the reflecting surface = D Time interval = t S = speed . 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."