Timeline for Estimating the current speed of sound
Current License: CC BY-SA 3.0
17 events
| when toggle format | what | by | license | comment | |
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| Aug 5, 2017 at 13:23 | comment | added | badjohn | @NilayGhosh Thanks. Interesting but I probably have the accuracy that I need already. | |
| Aug 5, 2017 at 13:12 | comment | added | Nilay Ghosh | Laplace correction | |
| Aug 1, 2017 at 10:20 | comment | added | badjohn | @tfb No offence was taken; it was an appropriate comment. The idea here is just to have a bit of fun and maybe learn something along the way. I hope to involve some suitable musical friends and a variety of children. | |
| Aug 1, 2017 at 9:33 | comment | added | user107153 | @badjohn Yes: sorry if it seemed I was disparaging the experiment: I think it's interesting in particular, and a really good thing in general that people actually do practical experiments. | |
| Aug 1, 2017 at 6:43 | comment | added | badjohn | @tfb Of course, that is only part of the experiment and, if it were the only one, then there would be much easier ways to achieve it. A potentially serious use would be for witnesses to give accurate speed estimates. A less ambitious use is just educational. | |
| Jul 31, 2017 at 22:52 | comment | added | user107153 | @badjohn I think if you wanted to know how good people's short-term pitch memory was (which is what let's you say 'perfect 4th') then there might be easier ways, given the existence of adjustable sources of pitches :-) | |
| Jul 31, 2017 at 17:24 | comment | added | badjohn | @tfb Well, finding out how good they are is one of my objectives. Actually, perfect pitch or pitch memory is not required. Even if we could identify the frequency of the note (when the vehicle was approaching) it would not tell us the speed unless we knew the true note. However (if my calculations are correct), we only need the interval between the note when the vehicle is approaching and receding. Any good musician should be able to do that. I can to within a semitone and maybe add a comment such as "a slightly flat perfect 4th". That does not give me 1km/h accuracy. | |
| Jul 31, 2017 at 17:13 | comment | added | user107153 | I think you might be surprised at how good human short-term pitch memory is. I can play a note on a piano, walk over to a guitar & play what should be the same note and generally know if they are in tune by well under 1Hz (based on, say 220Hz (open A on a guitar)). This works for only a few seconds as I forget the note I played. I don't have perfect pitch (or anything like it) and I don't think I am exceptional in any way -- in fact I would assume that proper musicians can do significantly better -- I've just done it a lot over many years. | |
| Jul 31, 2017 at 14:20 | history | tweeted | twitter.com/StackPhysics/status/892027111178993666 | ||
| Jul 31, 2017 at 11:52 | comment | added | Farcher | It is interesting that Hydrogen is omitted. I have always found Kaye and Laby a very useful source for such information. | |
| Jul 31, 2017 at 11:49 | vote | accept | badjohn | ||
| Jul 31, 2017 at 11:49 | comment | added | badjohn | @Farcher Thanks, that is very useful. It tells me that the effect of humidity is well below my 1% requirement. I don't think even my friends who are best able to judge relative pitch could be that accurate. The information on more exotic gases is interesting but more that I need. It is curious that deuterium is listed but not regular hydrogen. | |
| Jul 31, 2017 at 11:40 | history | edited | badjohn | CC BY-SA 3.0 |
Corrected just / well tempered mistype
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| Jul 31, 2017 at 11:37 | comment | added | Farcher | Some useful? data here. kayelaby.npl.co.uk/general_physics/2_4/2_4_1.html | |
| Jul 31, 2017 at 11:14 | answer | added | John Rennie | timeline score: 11 | |
| Jul 31, 2017 at 11:11 | history | edited | Qmechanic♦ |
edited tags
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| Jul 31, 2017 at 10:39 | history | asked | badjohn | CC BY-SA 3.0 |