In the book: "Introduction to Special Relativity" by Robert Resnick, Appendix C3: Gravitational red shift (I have the italian version), talking about photons, he says:(adsbygoogle = window.adsbygoogle || []).push({});

"...Actually, it's not necessary to use the Quantistic Theory. We can show from relativity itself that E is proportional to nu, since from relativistic transforms of energy and momentum, it comes that the energy of an electromagnetic pulse varies with the same factor of which varies its frequency when it's observed in a different frame of reference (see question 3)".

Is someone able to show me this? I am very interested in.

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# E = h*nu from Relativity

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