On Thursday, August 21, 2025 at 10:30:35 PM UTC-6 Brent Meeker wrote:
On 8/21/2025 6:19 PM, Alan Grayson wrote: Two related questions; if photons lose energy as the universe expands, where does the lost energy go? You didn't answer my question as to where the energy of a ball goes if you throw it into a moving car. I did. The two situations aren't comparable since the ball's kinetic energy is completely consumed when it comes to rest when being caught by the observer at rest, but not completely consumed when still moving when caught by the moving observer. So the energy isn't really "lost" in the latter case, just not consumed. That's one way to look at it, and you offered another, so I didn't think the issue was unresolved. AG And second; why don't the wave lengths of material particles, such as electrons, also decrease in energy as well, under the same circumtance? AG They do. The de Broglie wave length is h/p. Really? Has anyone theorized that the electron's wavelength becomes longer as the universe expands, which would require p to decrease? AG Brent -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/57d9ba44-13bb-4ba6-a54d-2a3241e804f4n%40googlegroups.com.
