https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/sound-topic/v/sound-properties-amplitude-period-frequency-wavelength 2024-06-22T14:02:12.128804105Z Sound properties: amplitude, period, frequency, wavelength How to find the amplitude, period, frequency, and wavelength for a sound wave David SantoPietro video https://cdn.kastatic.org/googleusercontent/-28N2RxY4hD_uRH3j_ZuPkQuA-Iw9NgCxfkJ4xcSSGNPujbIXuqOS0Fe3RRFFPRLrOYnnPhqB3cYeFRImwcoUcv9 Sound properties: amplitude, period, frequency, wavelength How to find the amplitude, period, frequency, and wavelength for a sound wave https://cdn.kastatic.org/ka-youtube-converted/-_xZZt99MzY.mp4/-_xZZt99MzY.mp4 316 Sound https://www.khanacademy.org/science/mh-grade-8-science/x0f256b8de9c7cf34:sound/x0f256b8de9c7cf34:sound-production-and-propogation/e/production-and-propagation-of-sound 2026-03-11T03:40:40.560880416Z Production and Propagation of sound Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:waves-sound-and-physical-optics/x0e2f5a2c:wave-properties/e/wave-characteristics-ap1 2026-04-07T23:36:17.218592739Z Properties of transverse and longitudinal waves Practice identifying the characteristics of a transverse or longitudinal wave such as the wavelength, crest, and areas of compression. April Russell exercise https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:waves-sound-and-physical-optics/x0e2f5a2c:wave-properties/e/transverse-and-longitudinal-wave-exercises-ap1 2026-04-07T23:55:07.30621384Z Identifying transverse and longitudinal waves Practice identifying representations of transverse and longitudinal waves April Russell exercise https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/sound-topic/v/speed-of-sound 2024-06-22T14:02:12.128804105Z Speed of sound How fast does sound travel? Explore the nature of sound waves and how they travel. Discover why sound is a longitudinal wave and how its speed is influenced by the medium it travels through. Learn about the relationship between wavelength, frequency, and speed, and how changing the medium affects the speed of sound. David SantoPietro video https://cdn.kastatic.org/googleusercontent/g9twfQyQh-YYHwHOUZsTBLe4oUQl5jx73qTOdapzjm78UP_6Q2GOLeXh7Pf28Z6HvCQdaWVRI_hPTVTzi_nCLPo Speed of sound How fast does sound travel? Explore the nature of sound waves and how they travel. Discover why sound is a longitudinal wave and how its speed is influenced by the medium it travels through. Learn about the relationship between wavelength, frequency, and speed, and how changing the medium affects the speed of sound. https://cdn.kastatic.org/ka-youtube-converted/UgE2GIQwUCw.mp4/UgE2GIQwUCw.mp4 225 Sound https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-sound-india/in-in-longitudinal-waves-speed-of-sound/v/after-how-long-ram-hears-a-splash 2020-06-23T07:22:43Z After how long, Ram hears a splash? Ram drops his phone from the bridge. Let's calculate how long it takes him to hear the sound of the splash.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/5bx_jzktGocnFopMj8bo5cbzvo75SdM7ONsbsAsM2hiFgX-0iTbj1WTKWz13Hx7rBD1Ome2t_8UiFhkkW_loQxWZuA After how long, Ram hears a splash? Ram drops his phone from the bridge. Let's calculate how long it takes him to hear the sound of the splash.  https://cdn.kastatic.org/ka-youtube-converted/3fzGBo-zvkc.mp4/3fzGBo-zvkc.mp4 690 Sound https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:waves-sound-and-physical-optics/x0e2f5a2c:wave-properties/e/numerical-wave-equation-ap1 2024-06-28T19:56:50.217380579Z Calculating wave speed, frequency, and wavelength Practice using the wave speed equation for word problems to find the frequency and wavelength of a wave.  April Russell exercise 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 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 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 https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/sound-topic/v/ultrasound-medical-imaging 2021-02-07T17:14:00Z Ultrasound medical imaging Ultrasound medical imaging (also known as sonography) is a diagnostic imaging tool that uses high-frequency sound waves to create images of structures in the body. Ultrasound images are captured in ​real time​ using an external probe and ultrasound gel placed directly on the skin. They can show things that a still image like an X-ray cannot, such as blood flow or organ movement. Ultrasound images are highly useful in the diagnosis and treatment of many diseases.  David SantoPietro video https://cdn.kastatic.org/googleusercontent/PlwLj88Kvn9N62rC6LxSN4TlSqNCgYPnmav1OcMjOp55WoM68UQvsx8cgI7p3s_8nqQWFQkAjeUHPZKW-W4JqlQ_ Ultrasound medical imaging Ultrasound medical imaging (also known as sonography) is a diagnostic imaging tool that uses high-frequency sound waves to create images of structures in the body. Ultrasound images are captured in ​real time​ using an external probe and ultrasound gel placed directly on the skin. They can show things that a still image like an X-ray cannot, such as blood flow or organ movement. Ultrasound images are highly useful in the diagnosis and treatment of many diseases.  https://cdn.kastatic.org/ka-youtube-converted/sTcqtljxLOk.mp4/sTcqtljxLOk.mp4 335 Sound https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-sound-india/in-in-ultrasound/v/echolocation-sonar 2020-06-23T07:22:42Z Echolocation & S.O.N.A.R Let's learn how animals and ships use echoes to 'see' the world around them. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/apmkAW-lPhTl4tZfgvWk0zAgcLQhZsg2fPIR1r8cvPibjWf_DYZUvgJ1bFVMXYv8ZiPFuECJGsb1uMo4zH9wncs Echolocation & S.O.N.A.R Let's learn how animals and ships use echoes to 'see' the world around them. https://cdn.kastatic.org/ka-youtube-converted/q_mEFtOGESA.mp4/q_mEFtOGESA.mp4 541 Sound https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:study-of-sound/x345505a97fc4a662:applications-of-reflection-of-sound/e/uses-of-reflection-of-sound-range-of-hearing 2026-03-12T00:50:35.110583553Z Uses of reflection of Sound and Applications of ultrasound Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/ms-physics/x1baed5db7c1bb50b:waves/x1baed5db7c1bb50b:sound-waves/v/human-ear-structure-working 2025-06-27T16:40:24.300084665Z Human ear Learn how our ears convert sound waves into a signal our brains can interpret. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/g97yY26PTxzrz21qFPK-OvpOkUe-x1d7K5FgokmhPurKKFfkp7tgStU9DTavYaB16TY80TS09VknUEv1Y3phbanJMQ Human ear Learn how our ears convert sound waves into a signal our brains can interpret. https://cdn.kastatic.org/ka-youtube-converted/98-6WfdumZY.mp4/98-6WfdumZY.mp4 456 Sound