On Sun, 21 May 2006, David VanHorn wrote:

> Ok, sanity check time.  I've had another one of those disturbing thoughts..
>
> Photons travel at the speed of light, and no other speed (in a given 
> media).  Correct? Time slows for a particle as it approaches C, and at 
> C a particle does not observe time passing at all. Correct?

It seems so. The photons that travel 4 billion years show no signs of 
'aging'.

> So how can a "timeless" particle interact with anything?  It would either
> always be interacting, or never be.

It helps if you think that everything is 'enery' from a certain point of 
view and certain kinds of energy interact when close enough for a long 
enough time. For waves the wave/particle duality helps with this. In 
general afaik no matter what interaction is studied, it is *either* a 
wave interaction *or* a particle interaction, and never both.

Peter
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