https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-sound-india/in-in-reflections-echoes-and-reverberation/v/echoes-and-reverberations 2020-06-23T07:22:40Z Echoes and reverberations Let's learn what Echoes and reverberations are. We will also see how to reduce reverberations as they could be pretty annoying Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/6axEv22HcHOGefCvwYLMnaPkZUjbK39Iu7pae43KGPq-uv6_EITGpQlmkD9DYhh9MPUa89WxyunYbRBAYViTYag9 Echoes and reverberations Let's learn what Echoes and reverberations are. We will also see how to reduce reverberations as they could be pretty annoying https://cdn.kastatic.org/ka-youtube-converted/LR-AYApQbNE.mp4/LR-AYApQbNE.mp4 537 12.7 Reflection of sound https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-sound-india/in-in-reflections-echoes-and-reverberation/v/minimum-distance-for-echo 2020-06-23T07:22:41Z Minimum distance for echo How far should an obstacle be to hear an echo? Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/y7ItbO4qOznD-U7r7ggpWlpAcgCOwAuvMWmgl2CXDfAiLat-_KvHaLhNldgJKzEx1ldFJw9vQLVx3kHJPx4HY4s Minimum distance for echo How far should an obstacle be to hear an echo? https://cdn.kastatic.org/ka-youtube-converted/LnZSnlQ7shs.mp4/LnZSnlQ7shs.mp4 492 12.7 Reflection of sound https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:study-of-sound/x345505a97fc4a662:reflection-of-sound/e/echo-and-reverberation 2026-03-12T00:50:35.110583553Z Echo and Reverberation Let's solve some questions! vibhor exercise