https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/sound-topic/v/decibel-scale 2023-09-10T17:11:17.624018169Z Decibel Scale Discover the magic of the Decibel Scale, the key to measuring sound intensity. Unpack the equation Beta = 10 log (I/10^-12), and marvel at the sensitivity of human hearing. Explore how logarithms transform large scales into manageable numbers, making the Decibel Scale a powerful tool in physics. David SantoPietro video https://cdn.kastatic.org/googleusercontent/n8eX7KSLd0LkeW0zRCIjgx1jzqztKC_aVEgR_m0jgZ6E6xkd2wFqgEASVnmoQMbdSupwRSPTkjkiAOfhOX1MSxj4 Decibel Scale Discover the magic of the Decibel Scale, the key to measuring sound intensity. Unpack the equation Beta = 10 log (I/10^-12), and marvel at the sensitivity of human hearing. Explore how logarithms transform large scales into manageable numbers, making the Decibel Scale a powerful tool in physics. https://cdn.kastatic.org/ka-youtube-converted/_p-WyPg1sbU.mp4/_p-WyPg1sbU.mp4 630 Wave intensity and the doppler effect https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/sound-topic/v/why-do-sounds-get-softer 2023-09-10T17:11:17.624018169Z Why do sounds get softer? This video explains why sound appears softer when you move away from the source. It covers two main reasons: the spreading of sound waves over a larger area (intensity), and the loss of some energy to the medium (attenuation). These concepts are key to understanding sound wave propagation. David SantoPietro video https://cdn.kastatic.org/googleusercontent/aLLI5uc9uCOMwygrGA14Y0v2DzX-4T0EJwEeQqPsvt71-8opSw64J-5HETJjnpTS3W5CVcviZtWT9Ha4SYzXvmQ-Zw Why do sounds get softer? This video explains why sound appears softer when you move away from the source. It covers two main reasons: the spreading of sound waves over a larger area (intensity), and the loss of some energy to the medium (attenuation). These concepts are key to understanding sound wave propagation. https://cdn.kastatic.org/ka-youtube-converted/46V8qqVRirk.mp4/46V8qqVRirk.mp4 528 Wave intensity and the doppler effect 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 Wave intensity and the doppler effect https://www.khanacademy.org/science/in-in-class11th-physics/in-in-11th-physics-waves/in-in-doppler-effect/v/introduction-to-the-doppler-effect 2023-09-10T17:11:17.624018169Z Doppler effect introduction Learn about the Doppler effect and how it explains the change in frequency of a wave when its source and an observer are moving. Understand how moving sound sources can alter the frequency and pitch we hear. Sal Khan video https://cdn.kastatic.org/googleusercontent/0lqkifyW0cQjFaEfjHz_qkIJuTyqq_wPd5EMnhy9TewOShlmnjfhomFel9iVGT0717MjzzOdXkKyOwFWdPOg6xM Doppler effect introduction Learn about the Doppler effect and how it explains the change in frequency of a wave when its source and an observer are moving. Understand how moving sound sources can alter the frequency and pitch we hear. https://cdn.kastatic.org/ka-youtube-converted/dc7l7Qqa8xk.mp4/dc7l7Qqa8xk.mp4 636 Wave intensity and the doppler effect https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:waves-sound-and-physical-optics/x0e2f5a2c:sound/e/doppler-effect-ap1 2026-04-08T00:16:02.937952483Z Doppler effect Predict how different observers hear different frequencies from a word problem or wavefront diagram. April Russell exercise https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:waves-sound-and-physical-optics/x0e2f5a2c:sound/a/doppler-effect-ap1 2024-05-31T20:54:35.154183629Z Doppler effect Learn about the Doppler effect. article https://www.khanacademy.org/science/in-in-class11th-physics/in-in-11th-physics-waves/in-in-doppler-effect/v/doppler-effect-formula-for-observed-frequency 2022-11-16T04:22:43.7414897Z Doppler effect formula for observed frequency The Doppler effect is the change in frequency of a wave as the source moves relative to an observer, and explains why the pitch of a sound sometimes changes as it moves closer or further to or from an observer. Learn how to derive the formula for perceived frequency of a sound using an equation that accounts for a sound and observer’s velocities relative to one another. Sal Khan video https://cdn.kastatic.org/googleusercontent/_usdS17w8l-zyjBt53Cj0CU-vMjLSt8BEsk87Mc0znS1Me8VwCeynIax3PlsPEfbhLktln55Phf_pmdtbEuECFJP Doppler effect formula for observed frequency The Doppler effect is the change in frequency of a wave as the source moves relative to an observer, and explains why the pitch of a sound sometimes changes as it moves closer or further to or from an observer. Learn how to derive the formula for perceived frequency of a sound using an equation that accounts for a sound and observer’s velocities relative to one another. https://cdn.kastatic.org/ka-youtube-converted/kGrk6V8tWDY.mp4/kGrk6V8tWDY.mp4 613 Wave intensity and the doppler effect