3 ms·
Except that's not what we measure. Instead we find the speed of a photon depends only on the medium, not on the motion of the source or receiver.
by jasonwatkinspdx 14y ago
Except that's not what we measure. Instead we find the speed of a photon depends only on the medium, not on the motion of the source or receiver.
- StavrosK 14y agoYou aren't listening to me. The speed of the photon is c in the direction it's traveling, a photon traveling due west is going north with no speed at all.
- xnxn 14y agoI don't think it makes sense to say that the speed of a photon is c "in a direction", since speed is a scalar quantity. (correct me if I'm wrong, I'm terrible at physics!)
- shardling 14y agoHere, speed is a measure of the magnitude of velocity. It's perfectly acceptable to describe velocity (or a component thereof) as speed in a particular direction.