Timeline for Is EM radiation flux an extensive or intensive property?
Current License: CC BY-SA 4.0
19 events
| when toggle format | what | by | license | comment | |
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| Aug 17, 2022 at 7:41 | comment | added | John Murphy | @jensenpaull You may want to look at this "paper". Would be interested in your comments. cloudup.com/cljKgkNVH8o | |
| Aug 16, 2022 at 5:49 | comment | added | John Murphy | Slight mistake in file; please use this one cloudup.com/cljKgkNVH8o | |
| Aug 16, 2022 at 5:33 | comment | added | John Murphy | @ProfRob. I'm never quite sure how this works - but see the comment above. The file can be seen at cldup.com/nkUQa-UIhJ.pdf Would be interested to know what you think. | |
| Aug 16, 2022 at 5:31 | comment | added | John Murphy | @jensenpaull and others. The file can be seen here cldup.com/nkUQa-UIhJ.pdf The results are fairly conclusive, but it needs to be performed in a vacuum if only for completeness. The conclusion is that radiative flux has "intensive" properties and should not be "added" to other radiative flux streams. Further, given two sources, the temperature created at a target is the same as the highest created by either of the two individual sources. All comments, suggestions etc welcome - including offers to run something similar in a vacuum with good equipment. | |
| Aug 10, 2022 at 0:24 | comment | added | John Murphy | @ProfRob will do late this week or early next week. Will put on DropBox or GDrive - but if there is a "usual" location for these type of files (2/4 page PDF) please let me know. | |
| Aug 8, 2022 at 16:56 | comment | added | ProfRob | @JohnMurphy please publish the details and results of your home experiment that shows that two light bulbs are not twice as bright as one light bulb. It would be big news indeed for light bulb manufacturers. | |
| Aug 1, 2022 at 7:19 | comment | added | John Murphy | Jensen Paull's answer is correct. Not only that, from a simple (but not so crude) home experiment, it appears that if you have two sources and one target: If Source A produces Ta at the target, Source B produces Tb at the target, then with both sources on, the target becomes Ta or Tb whichever is the greater. Adding fluxes together creates temperature which are much too high. I'll be happy to post my two-page description somewhere is there is a need. | |
| Jul 30, 2022 at 14:26 | comment | added | ProfRob | Because it isn't the correct answer to the question asked. Radiation flux can be combined by simple addition and $S_{1+2} = S_1 + S_2$, except in cases where you are trying to combine the light from two coherent light sources. G.Smith's comment that you disagreed with, is correct. | |
| Jul 30, 2022 at 9:57 | comment | added | jensen paull | Why the down vote? | |
| Apr 11, 2022 at 5:30 | comment | added | John Murphy | This is an extremely interesting answer that has huge implications in other areas. I would like to continue the discussion offline. I have just a couple of questions / observations; please contact me at [email protected] (a hide-my-email from Apple). Thanks, johnM | |
| Feb 17, 2022 at 15:48 | comment | added | GrapefruitIsAwesome | I think there's some discussion of coherence and expectation required here. If the sources are not coherent then the expected values of the cross terms would go to zero? | |
| Feb 17, 2022 at 15:31 | history | edited | jensen paull | CC BY-SA 4.0 |
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| Jan 17, 2022 at 0:11 | history | edited | jensen paull | CC BY-SA 4.0 |
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| Jan 16, 2022 at 22:36 | history | edited | jensen paull | CC BY-SA 4.0 |
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| Jan 16, 2022 at 22:26 | history | edited | jensen paull | CC BY-SA 4.0 |
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| Jan 16, 2022 at 22:16 | history | undeleted | jensen paull | ||
| Jan 16, 2022 at 22:15 | history | edited | jensen paull | CC BY-SA 4.0 |
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| Jan 16, 2022 at 22:11 | history | deleted | jensen paull | via Vote | |
| Jan 16, 2022 at 22:10 | history | answered | jensen paull | CC BY-SA 4.0 |