2020/08/30 by Ademir Xavier, Ademir Xavier Jr, Xavier, Ademir
Physics and Astronomy · #Classical Physics (physics.class-ph) #Experimental and Theoretical Physics Studies #FOS: Physical sciences #Radioactive Decay and Measurement Techniques #Relativity and Gravitational Theory #physics.class-ph
paper · pdf · doi:10.48550/arxiv.2009.01925
Submitted to Physics Education (February 2020)
arxiv created 2020/08/30 · openalex publication_date 2020/08/30 · arxiv updated 2020/09/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
This work considers the cospectral and arbitrary light emission of a moving source. The observed wavelengths of the emitted photons are described in term of kinematic and dynamical Doppler shifts in which the mass-energy relation plays a fundamental role. The presentation is an alternative way of emphasizing the importance of the concept of proper mass as a conserved quantity and the implications of the mass-energy relation when a source emits radiation. The physical contexts in which the source changes velocity after emission are discussed and a set of additional problems is presented.