The TRANSMISSION of acoustic energy through a medium via a SOUND WAVE. See: SOUND ... Wiener and Keast, "Experimental Study of the Propagation of Sound Over Ground," Journal of the Acoustical Society ...
DARPA is Using Earth’s Atmosphere as a Sensor to Detect Secret Explosions and Spacecraft Reentries
DARPA is using Earth’s atmosphere as a powerful sensor, allowing the detection of events like rocket reentries and illicit ...
There are several important factors which affect the propagation of sound ... When the source and receiver are both close to the ground, the sound wave reflected from the ground may interfere ...
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