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This may seem like a strange question but the answer is at the heart of the relationship between different types of energy. What is the answer?

Quote from: jeffreyHThis may seem like a strange question but the answer is at the heart of the relationship between different types of energy. What is the answer?Your question isn't strange at all. In fact it's a very good question. Since the proper mass of a photon is zero, i.e. m_{0}, the proper energy E_{0} = m_{0}c^{2} is also zero, i.e. E_{0} = 0. Since energy is the sum of kinetic energy plus proper energy, i.e.E = K + E_{0}It follows that since E_{0} = 0 thatE = K + E_{0} = Ki.e.E = KTherefore the energy of a photon is 100% kinetic energy.

The result is obviously correct but I don't understand your derivation, because I don't know what you mean with "proper mass of a photon".

That is exactly what I expected the answer to be but by strange I mean the answer appears obvious but I am not convinced. The mathematics say so but is it right?

Quote from: jeffreyH on 07/12/2014 21:26:19That is exactly what I expected the answer to be but by strange I mean the answer appears obvious but I am not convinced. The mathematics say so but is it right?Yes. It's right. Don't forget that that math is merely the language that we use to describe nature and mathematical technique's are synonymous to our use of logic and critical thinking. Therefore if the math says its right then it's right as far as our critical thinking goes.

I read your page on relativistic mass and it was very helpful.