> >Since h, n, c, and v are constants (you are saying you know v, aren't you > >?), the only thing left to change to fix the equation is mu, but mu is the > >frequency. One may be SAYING one knows the velocity is constant, but what does one know? :-) Once you allow arcanery then anything can happen. By constant velocity one probably means that, as a classical observer, that constant distance is travelled in constant time as one observes distance and time. If time and distance are also variable, and even a function of the velocity that you are trying to express them in terms of then it all gets a bit grey. Interesting thought. At light-speed, time and distance fall to zero. All light speed particles are timeless. All the processes they will ever undergo occur instantaneously for them. SO - ALL photons are everywhere all at once from their point of view, in instantaneous timeless communications with all other photons. A photon travelling from eg the sun and another travelling from eg Abell 1835 IR1916 (reputedly farthest known galaxy from earth) both neither travel or arrive in time order - they just "are". All from their own perspective of course, No wonder they're confused :-) RM -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads