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M Ivker
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Has anyone encountered the term "hypersonic sound speed" in connection with fluctuations of thermodynamic quantities in condensed matter? How is hypersonic different than regular sound?
Hypersonic speed refers to the speed of sound waves that are faster than the speed of sound in normal air at sea level. Regular sound speed, on the other hand, refers to the speed of sound in normal air at sea level. In condensed matter, such as solids and liquids, the speed of sound is significantly higher than in air, making it possible for sound waves to reach hypersonic speeds.
The speed of sound in condensed matter is affected by both temperature and pressure. As temperature increases, the molecules in the material move faster, resulting in a higher speed of sound. Similarly, an increase in pressure causes the molecules to be closer together, resulting in a higher speed of sound.
Hypersonic and regular sound speed in condensed matter have various real-world applications, including ultrasonic imaging in medicine, non-destructive testing in engineering, and sonar technology in the military. These speeds can also be used to study the properties of materials and their behavior under extreme conditions.
No, hypersonic speeds can only be achieved in certain types of condensed matter, such as solids and liquids. In gases, the speed of sound is already close to the speed of sound in air at sea level, so it is not possible to achieve hypersonic speeds.
The speed of sound in condensed matter is significantly lower than the speed of light. For example, in air at sea level, the speed of sound is approximately 343 meters per second, while the speed of light is approximately 299,792,458 meters per second. This difference in speed is due to the different ways in which sound and light travel through a medium.