In acoustics, the sound speed gradient is the rate of change of the speed of sound with distance, for example with depth in the ocean,or height in the Earth's atmosphere. A sound speed gradient leads to refraction of sound wavefronts in the direction of lower sound speed, causing the sound rays to follow a curved path. The radius of curvature of the sound path is inversely proportional to the gradient. When the sun warms the Earth's surface, there is a negative temperature gradient in atmosphere. The speed of sound decreases with decreasing temperature, so this also creates a negative sound speed gradient. The sound wave front travels faster near the ground, so the sound is refracted upward, away from listeners on the ground, creating an acoustic shadow at some distance from the source. The opposite effect happens when the ground is covered with snow, or in the morning over water, when the sound speed gradient is positive. In this case, sound waves can be refracted from the upper levels down to the surface. In underwater acoustics, speed of sound depends on pressure (hence depth), temperature, and salinity of seawater, thus leading to vertical speed gradients similar to those that exist in atmospheric acoustics. However, when there is a zero sound speed gradient, values of sound speed have the same "isospeed" in all parts of a given water column (there is no change in sound speed with depth). The same effect happens in an isothermal atmosphere with the ideal gas assumption. (Wikipedia).
Show Me Some Science! Speed Of Sound
Sound is a wave which travels through the air at about 330 m/s. The Little Shop of Physics Crew dances to the music together. When spread out along the track, it takes about a third of a second for the sound to travel from the first person to the last. The crew is blindfolded, so there are
From playlist Show Me Some Science!
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Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to calculate the intensity of sound wave 2.
From playlist PHYSICS MECHANICS 5: WAVES, SOUND
Physics - Mechanics: Sound and Sound Waves (13 of 47) Sound Intensity at a Distance
Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to calculate I=? at distances of 10m, 1000m, and 10,000m.
From playlist PHYSICS MECHANICS 5: WAVES, SOUND
Physics - Mechanics: Sound and Sound Waves (35 of 47) Intensity of Sound Wave 1
Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to calculate the intensity of sound wave.
From playlist PHYSICS MECHANICS 5: WAVES, SOUND
Physics - Mechanics: Sound and Sound Waves (34 of 47) Maximum Displacement in a Sound Wave
Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to calculate the maximum displacement in a sound wave.
From playlist PHYSICS MECHANICS 5: WAVES, SOUND
Breaking the sound barrier in water or air. My Patreon page is at https://www.patreon.com/EugeneK
From playlist Physics
Seminar In the Analysis and Methods of PDE (SIAM PDE): Vlad Vicol
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From playlist Seminar In the Analysis and Methods of PDE (SIAM PDE)
Compressibility Effects in Turbulence: Revisited by Sanjiva Lele
Turbulence from Angstroms to light years DATE:20 January 2018 to 25 January 2018 VENUE:Ramanujan Lecture Hall, ICTS, Bangalore The study of turbulent fluid flow has always been of immense scientific appeal to engineers, physicists and mathematicians because it plays an important role acr
From playlist Turbulence from Angstroms to light years
HEDS Seminar Series | Joyce Guzik | “Solar Models and Opacities”
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From playlist High Energy Density Science Seminar Series
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From playlist Imaging & Inverse Problems (IMAGINE) OneWorld SIAM-IS Virtual Seminar Series
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From playlist Mathematics
Science of Flight | Breaking the Sound Barrier and Beyond | The Great Courses
If you want to see what it looks like inside a plane breaking the sound barrier, just look down the street on a hot day. This is because the same principles that cause mirages on summer streets dictates the shockwaves at Mach 1. Call the drink cart; it's going to be a smooth ride. This vi
From playlist Science
Henk van Beijeren - KPZ equation
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The Wave Equation for BEGINNERS | Physics Equations Made Easy
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From playlist Classical Physics by Parth G
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From playlist PHYSICS: Waves
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