Quantization, Doppler Shift and invariance of the speed of light: some didactic problems and opportunities, G. Margaritondo, Eur. J. Phys. 16 (1995) 169-171
Abstract. I discuss some of the discuss some of the didactic problems in the introduction to quantum physics based on the concept of photon. I specifically argue that the derivation of the photon energy from the relativistic Doppler shift offers stimulating didactic opportunities. A detailed form of this derivation reveals the subtle link between relativity and the invariance of the speed of light.