"Sound waves are also of interest to materials scientists because sound waves are related to important elastic properties including the ability to resist stress," Pickard said. Researchers performed state-of-the-art quantum mechanical calculations to test this prediction and found that the speed of sound in solid atomic hydrogen is close to the theoretical fundamental limit. The speed of sound in dry air at 20 C is 343 m/s and the lowest frequency sound wave that the human ear can detect is approximately 20 Hz. This prediction implies that the sound is the fastest in solid atomic hydrogen. The scientists tested their theoretical prediction on a wide range of materials and addressed one specific prediction of their theory that the speed of sound should decrease with the mass of the atom. So plugging in the numbers you get 1700 meters, a tad over one mile. The distance-speed-time relationship is d Vt. 1 speed of sound to km/h 1225.044 km/h 2 speed of sound to km/h 2450.088 km/h 3 speed of sound to km/h 3675.132 km/h 4 speed of sound to km/h 4900.176 km/h 5 speed of sound to km/h 6125.22 km/h 6 speed of sound to km/h 7350.264 km/h 7 speed of sound to km/h 8575.308 km/h 8 speed of sound to km/h 9800. For ’back of the envelope’ calculations you can take V 340 km/sec. This speed varies slightly depending on the temperature, pressure and humidity. The new findings suggest that these two fundamental constants can also influence other scientific fields, such as materials science and condensed matter physics, by setting limits to specific material properties such as the speed of sound. The distance depends on the speed of sound in air. The study, published in the journal Science Advances, shows that predicting the upper limit of the speed of sound is dependent on two dimensionless fundamental constants - the fine structure constant and the proton-to-electron mass ratio. For example, seismologists use sound waves initiated by earthquakes deep in the Earth interior to understand the nature of seismic events and the properties of Earth composition," explained Professor Chris Pickard, Professor of Materials Science at the University of Cambridge. "Sound waves in solids are already hugely important across many scientific fields. However, it was not known to date whether sound waves also have an upper speed limit when travelling through solids or liquids. This method is based on the fact that light travels much faster than sound through the atmosphere: Light travels at 186,291 miles per second (299,800 km/s), whereas the speed of sound is only. Einstein's theory of special relativity sets the absolute speed limit at which a wave can travel which is the speed of light, and is equal to about 300,000 km per second.
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