Timeline for If photons have no acceleration, how can they have energy and momentum? [duplicate]
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
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| Sep 23, 2016 at 21:23 | history | closed |
ACuriousMind♦ Jon Custer user36790 Emilio Pisanty honeste_vivere |
Duplicate of If photons have no mass, how can they have momentum? | |
| Sep 23, 2016 at 2:59 | history | edited | Qmechanic♦ | CC BY-SA 3.0 |
added 2 characters in body; edited tags
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| Sep 23, 2016 at 1:41 | review | Close votes | |||
| Sep 23, 2016 at 21:23 | |||||
| Sep 22, 2016 at 23:27 | comment | added | dmckee --- ex-moderator kitten | Even for massive particles $m \,\Delta \vec{v}$ represents a change in momentum. | |
| Sep 22, 2016 at 23:12 | vote | accept | CommunityBot | ||
| Sep 22, 2016 at 23:08 | comment | added | user130451 | @wnoise sorry, I incorrectly believed that momentum equals mass* change in velocity. So photons have no momentum change, but have a momentum. I believe that the sum of force times the time elapsed equals mass times change in velocity, so force times time equals change in momentum | |
| Sep 22, 2016 at 23:01 | comment | added | wnoise | Why do you think a change in speed (or a non-zero acceleration) is necessary to have momentum? (Technically, only a change in velocity is necessary to have a non-zero acceleration. Speed is only the scalar length of the velocity vector. If the velocity changes direction, but not magnitude, the body is still accelerating.) | |
| Sep 22, 2016 at 22:16 | answer | added | SuchDoge | timeline score: 2 | |
| Sep 22, 2016 at 22:11 | comment | added | ACuriousMind♦ | Duplicate of physics.stackexchange.com/q/2229/50583 | |
| Sep 22, 2016 at 22:09 | history | asked | user130451 | CC BY-SA 3.0 |