Space.com says...
https://www.space.com/2494-slow-sound-scream-mars.html
Trees and bushes would probably cut that distance quite a bit, but I don't have any numbers. Vegetation introduces its own issues, of course.
Can she scream into a heavy bag instead??
HTH!!
Cheers,
Scott.
Scientists from Penn State University set up a computer simulation to figure out how far a sound wave would travel in Mars' thin air.
On Earth, the sound from an average scream might travel about three-quarters of a mile, depending on conditions. But it would only make it about 53 feet on Mars, according to Amanda Hanford, a researcher on the project.
Similarly, sound produced by a lawnmower travels several miles in open air on Earth, but would go only a couple hundred feet on Mars.
Trees and bushes would probably cut that distance quite a bit, but I don't have any numbers. Vegetation introduces its own issues, of course.
Can she scream into a heavy bag instead??
HTH!!
Cheers,
Scott.