Space/Science » in reply to Radiometers and solar sails don't work if light has no mass to plug into the momentum equation.

The whole thread (36 posts)

• I wonder why - Johannes - 4/17/2008 8:33:33 PM
  • "Hot" in this context relates to particle velocities, not "temperature" as such. (n/t) - TB - 4/18/2008 12:41:04 AM
    • Hot IS particle velocity in this context. - et - 4/18/2008 5:50:17 PM
      • So, if you create a total vacuum, what's the temperature inside it? (n/t) - RobVG - 4/19/2008 1:08:41 AM
        • Temperature measures the thermal energy in a volume. - et - 4/19/2008 8:13:45 PM
        • That's like asking what the pressure is. - TB - 4/19/2008 2:03:36 AM
        • re: Would your total vacuum exclude photons? - Johannes - 4/19/2008 1:46:08 AM
          • Found will looking for something else. - RobVG - 4/22/2008 6:14:16 PM
            • "while" -(shees, sometimes forget to look at what I typed) (n/t) - RobVg - 4/22/2008 10:47:28 PM
              • re: "while" -(shees, sometimes forget to look at what I typed) (n/t) - hafid - 4/29/2008 9:44:43 PM
          • Do photons have Temperature? - nick hoffman - 4/20/2008 9:30:17 AM
          • Google photon gas. (n/t) - et - 4/19/2008 8:11:34 PM
          • Do photons have mass? (n/t) - RobVG - 4/19/2008 2:01:05 AM
            • Johannes, this is a SCIENCE board, NOT religion - Moderator Nick - 4/20/2008 9:35:35 AM
              • re: Sorry about the conflict, but…….. - Johannes - 4/21/2008 2:09:42 AM
            • Not in the conventional sense. (n/t) - et - 4/19/2008 8:10:01 PM
              • Radiometers and solar sails don't work if light has no mass to plug into the momentum equation. (n/t) - alcaray - 4/19/2008 8:38:47 PM
                • Photons have no mass, but they do have momentum, and it is conserved. (n/t) - ER - 4/20/2008 1:19:28 AM
                  • I stand corrected. (Though I don't understand it. The quantum world is very odd.) (n/t) - alcaray - 4/20/2008 2:23:04 AM
                    • Photons are electric and magnetic field packets. - et - 4/21/2008 8:04:54 PM
                  • re: How is the momentum of a photon generated? (n/t) - Johannes - 4/20/2008 1:35:55 AM
                    • Starship sailors - ER - 4/20/2008 3:05:06 AM
                      • re: Epiphenomena yes but - Johannes - 4/21/2008 1:42:19 AM
                        • Epiphenomena yes, period. - ER - 4/21/2008 1:45:13 PM
                          • re: How and why. - Johannes - 4/21/2008 10:49:31 PM
                            • re: How and why. - ER - 4/22/2008 12:46:37 AM
                              • re: Thank you for your explanation. - Johannes - 4/22/2008 2:48:21 AM
      • re: In other words, diffuse and high in kinetic energy. (n/t) - Johannes - 4/18/2008 8:10:52 PM
      • I remember this from junior high school - TB - 4/18/2008 6:36:44 PM
    • re: - yep, charged particles. - Marcia - 4/18/2008 2:04:46 AM
      • re: - Thanks for the info - Johannes - 4/18/2008 3:13:04 AM
        • There's a LOT you don't understand. - nick hoffman - 4/18/2008 3:18:27 AM
          • Gentlemen, gentlemen,,, - ER - 4/20/2008 2:48:01 PM
            • Feynmann and others - TB - 4/20/2008 7:23:38 PM
          • re: There's a LOT you don't understand. - Johannes - 4/18/2008 8:07:58 PM
          • Him and me both. - et - 4/18/2008 5:49:04 PM