Scientists have revealed that there are two speeds of sound on the surface of Mars, one for high-pitched noises like a laser blasting off and the other for low frequencies like the hum of a helicopter’s rotor. of its own microphones.
Experts have now presented their first analysis of five hours of sound captured by the rover, which revealed a calm planet with occasional winds where two different speeds of sound have a strange delayed effect on hearing.
The sound also picked up a turbulence not previously known on the surface of Mars, according to Sylvester Morris, co-scientific director of SuperCam installed on the rover mast that contains the main microphone.
The international team also listened to the flights of the small Ingenuity helicopter, which was transported to Mars on the belly of the Perseverance, and heard the sounds of the probe’s laser rocks to study its chemical composition.
The study confirmed for the first time that the speed of sound is slower on Mars, traveling at 787 feet per second (240 meters per second), compared to 1,115 feet per second (340 meters per second).
This was expected because Mars’ atmosphere contains 95 percent of carbon dioxide compared to 0.04 percent of Earth’s, which is about 100 times thinner, making the sound 20 decibels weaker.
But scientists were surprised when the sound from the laser took 250 meters per second, 10 meters faster than expected.
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