02-02-2006, 11:54 PM
Ohhh.. hard one this. I'm not sure there is one exact definition of energy really. You can say energy is the ability to do mechanical work or in a physics sense i guess energy is a quantity that belongs to any physical system. Light energy intrigues me though, from light energy we get heat, the ability too see etc but is it(a photon) a particle of light, a light wave or a particle of energy or all of these, i dont know for sure.


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