On Mars, the relaxation after a high-pitched sound happens faster than after a low-pitched sound. This is called the relaxation effect.įor sound waves traveling through air, relaxation depends on the frequency of the sound and the type of molecules in the air. Air will gradually move that energy around. When a sound wave moves through air or a fluid, it adds energy to the molecules around it.
He was not involved in the new research, but he does study how sound waves move through different materials. He’s a physicist at Central Washington University, in Ellensburg. “For an Earthling, this may be surprising. Explainer: Understanding waves and wavelengths The higher sounds dissipate over even shorter spans. Those low-pitched waves will travel just a few meters before becoming inaudible. Low-pitched sounds travel slower - about 240 meters per second (537 miles per hour). Within the range of human hearing, high-pitched sounds travel at about 250 meters per second (559 miles per hour). These data allowed the researchers to measure the speed of sound on Mars - and revealed a surprise. Chide and his team studied about five hours’ worth of sounds collected in this way. That zap created a sound wave - similar to thunder, but on a much smaller scale. They were noises made when the rover fired a laser at small rocks nearby. What Perseverance recorded weren’t the sounds of events on Mars.
JPL-Caltech/NASA, LANL, CNES, CNRS, ISAE-Supaéro
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