LJP07 Posted March 29, 2007 Report Share Posted March 29, 2007 Scientists have figured out how to create a jet of liquid with nothing but the power of light: :) LiveScience.com - Pressure of Light Can Move Liquid Quote Link to comment Share on other sites More sharing options...
LJP07 Posted March 29, 2007 Author Report Share Posted March 29, 2007 As I was reading this, I get a little confused, I understand that light is massless, but it moves at the speed of light: E=MC2, but if light is a form of energy, it must multiply by something to be counted as energy as E = (0)(Light)2, this means E=0, so there is no energy yet light is a form of energy, can this be true, I'm missing something? Is this type of intrinsic mass, where it's the momentum and energy and it's frame of reference {(mc)2 = E2 - (pc)2} are taken into account? Quote Link to comment Share on other sites More sharing options...
Jay-qu Posted March 31, 2007 Report Share Posted March 31, 2007 Light has a momentum, but doesnt have a mass - the momentum = h/lambda. It doesnt have anything to do with mv - so its useless to try and calculate a value for the mass of a photon, because like you said - its massless. Also the energy of a photon can be calculated by E=hf. Interestingly the equations are consistant if you persist in calculating a mass for the photon: mv=h/lambdam=h/(lambda*c) E=mc^2E=(h/(lambda*c))c^2E=hc/lambdaE=hf Quote Link to comment Share on other sites More sharing options...
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