mannzzu Posted March 30, 2010 Share Posted March 30, 2010 if rest mass of photon is zero!! when photon collides with a surface it will lose some energy satisfied by E2-E1 of metal. but at this time during collision photon comes to momentary rest(by some micro seconds)!!!!! does this mean at this time its mass is zero?? if so when it continues its motion where does it regain energy:rolleyes: Link to comment Share on other sites More sharing options...
ydoaPs Posted March 30, 2010 Share Posted March 30, 2010 It doesn't stop. It gets absorbed by the material and a lower energy photon is then emitted. Link to comment Share on other sites More sharing options...
mannzzu Posted March 30, 2010 Author Share Posted March 30, 2010 if photon is considered particle during motion why don't we consider of it bouncing back after giving some energy!! why do we only consider absorption and re emission Link to comment Share on other sites More sharing options...
sr.vinay Posted March 30, 2010 Share Posted March 30, 2010 You're not considering basic laws of Physics here. ydoaPs is right. You can't talk about collision of photons in this context either. Link to comment Share on other sites More sharing options...
swaha Posted March 31, 2010 Share Posted March 31, 2010 if it doent bounce back the why is it called collision? Link to comment Share on other sites More sharing options...
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