Physics Help Forum Interaction of matter and radiation

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Aug 13th 2014, 09:07 PM #1 Junior Member   Join Date: Aug 2014 Posts: 3 Interaction of matter and radiation To whom is able to answer this: I think that when radiant energy get in contact with matter three basic phenomena take place: 1.- Transmission 2.- Reflection 3.-Absorption and emission I think this three basic phenomena enclose all phenomena that can occur after the interaction I wait for your answer With all the best Marco Uscanga
 Aug 14th 2014, 04:46 AM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,347 I'm not sure what your question is, but it is correct that the energy of the incident radiation on an object is equal to the sum of the energy that is (a) absorbed by the object, (b) transmitted through the object,and (c) reflected by the object. You have "absorption and emission," I suppose because you assume they must be equal, which is true if the object is in thermal equilibrium. But in effect you are double counting absorption.
 Aug 14th 2014, 05:03 AM #3 Senior Member     Join Date: Apr 2008 Location: Bedford, England Posts: 668 I am thinking that there might be an extra division in the Transmission category. a) the matter and the radiation totally ignore each other. b) the matter and radiation mutually interact, but the radiation carries on after (e.g. refraction).
Aug 14th 2014, 07:20 AM   #4
Physics Team

Join Date: Jun 2010
Location: Morristown, NJ USA
Posts: 2,347
 Originally Posted by MBW I am thinking that there might be an extra division in the Transmission category. a) the matter and the radiation totally ignore each other. b) the matter and radiation mutually interact, but the radiation carries on after (e.g. refraction).
Yes, these are both counted in the "transmission" category.