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| From | Jan Panteltje <alien@comet.invalid> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: OT: sound speed depends on frequency on mars |
| Date | 2024-08-31 07:31 +0000 |
| Message-ID | <vaugt9$1va92$1@solani.org> (permalink) |
| References | <vas9g2$1so9m$1@solani.org> <vgl3dj9uq2t9bmo6miqr8faaiuoi1d24c2@4ax.com> |
On a sunny day (Fri, 30 Aug 2024 07:34:05 -0700) it happened john larkin <jlarkin_highland_tech> wrote in <vgl3dj9uq2t9bmo6miqr8faaiuoi1d24c2@4ax.com>: >On Fri, 30 Aug 2024 11:13:05 GMT, Jan Panteltje <alien@comet.invalid> >wrote: > >>NASA's Mars rover Perseverance has found that sound travels much more slowly on the Red Planet than it does on Earth >>and behaves in some unexpected ways that could have strange consequences for communication on the planet. >> https://www.space.com/nasa-mars-rover-perseverance-speed-of-sound#main >> At frequencies above 240 Hertz, "the collision-activated vibrational modes of carbon dioxide molecules do not have enough >> time to relax, or return to their original state," >> the researchers said, which results in sound waves at higher frequencies traveling more than 32 feet per second (10 m/s) >> faster than the low-frequency ones. >> That means that if you were standing on Mars, listening to distant music, you would hear higher-pitched sounds before you >> would hear the lower-pitched ones. >> >>paper: >> https://www.hou.usra.edu/meetings/lpsc2022/pdf/1357.pdf >> >>So... >>Music from far away may sound funny? >> >>For Mars we will need compensation headphones with distance measurement and variable delays.... >>;-) >> >>Better use radio.. and earplugs/ headphones... >> >> >> > >Funny, I just delivered a lecture on transmission lines and noted that >microstrips have dispersion from the unbalanced dielectric constants >and skin effect. Rising edges get sloppy at the and of a long trace. > >I wonder if anyone has added surface-mount Heaviside loading coils to >a PCB trace. > >https://en.wikipedia.org/wiki/Loading_coil > >There used to be millions of 88 mH toroids on the surplus market, >telephone loading coils. > >The Mars thing is no big deal. You'd be dead too soon to worry about >acoustics. Imagine Burning Man (literally!) on Mars. It may matter for sonar based systems, distance measurements etc.. I have some small sonar based modules in use from ebay, something like these: https://www.ebay.nl/itm/185960647108
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OT: sound speed depends on frequency on mars Jan Panteltje <alien@comet.invalid> - 2024-08-30 11:13 +0000
Re: OT: sound speed depends on frequency on mars john larkin <jlarkin_highland_tech> - 2024-08-30 07:34 -0700
Re: OT: sound speed depends on frequency on mars Bill Sloman <bill.sloman@ieee.org> - 2024-08-31 01:23 +1000
Re: OT: sound speed depends on frequency on mars john larkin <jl@650pot.com> - 2024-08-30 10:10 -0700
Re: OT: sound speed depends on frequency on mars Bill Sloman <bill.sloman@ieee.org> - 2024-08-31 16:17 +1000
Re: OT: sound speed depends on frequency on mars john larkin <jlarkin_highland_tech> - 2024-08-31 07:18 -0700
Re: OT: sound speed depends on frequency on mars Bill Sloman <bill.sloman@ieee.org> - 2024-09-01 02:37 +1000
Re: OT: sound speed depends on frequency on mars john larkin <jlarkin_highland_tech> - 2024-08-31 12:31 -0700
Re: OT: sound speed depends on frequency on mars Jeroen Belleman <jeroen@nospam.please> - 2024-08-31 22:52 +0200
Re: OT: sound speed depends on frequency on mars john larkin <jlarkin_highland_tech> - 2024-08-31 16:32 -0700
Re: OT: sound speed depends on frequency on mars Jeroen Belleman <jeroen@nospam.please> - 2024-09-01 20:37 +0200
Re: OT: sound speed depends on frequency on mars john larkin <jlarkin_highland_tech> - 2024-09-01 11:49 -0700
Re: OT: sound speed depends on frequency on mars Bill Sloman <bill.sloman@ieee.org> - 2024-09-01 15:34 +1000
Re: OT: sound speed depends on frequency on mars john larkin <jlarkin_highland_tech> - 2024-09-01 07:27 -0700
Re: OT: sound speed depends on frequency on mars Bill Sloman <bill.sloman@ieee.org> - 2024-09-02 01:24 +1000
Re: OT: sound speed depends on frequency on mars john larkin <jlarkin_highland_tech> - 2024-09-01 09:32 -0700
Re: OT: sound speed depends on frequency on mars Bill Sloman <bill.sloman@ieee.org> - 2024-09-02 18:23 +1000
Re: OT: sound speed depends on frequency on mars john larkin <jlarkin_highland_tech> - 2024-09-02 09:02 -0700
Re: OT: sound speed depends on frequency on mars Bill Sloman <bill.sloman@ieee.org> - 2024-09-03 15:48 +1000
Re: OT: sound speed depends on frequency on mars john larkin <jlarkin_highland_tech> - 2024-09-04 07:58 -0700
Re: OT: sound speed depends on frequency on mars Bill Sloman <bill.sloman@ieee.org> - 2024-09-05 15:58 +1000
Re: OT: sound speed depends on frequency on mars john larkin <jlarkin_highland_tech> - 2024-09-05 07:19 -0700
Re: OT: sound speed depends on frequency on mars Bill Sloman <bill.sloman@ieee.org> - 2024-09-06 21:52 +1000
Re: OT: sound speed depends on frequency on mars Bill Sloman <bill.sloman@ieee.org> - 2024-09-05 15:59 +1000
Re: OT: sound speed depends on frequency on mars Jan Panteltje <alien@comet.invalid> - 2024-08-31 07:31 +0000
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