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Let's say that an event releases a 1 second burst of EM radiation that propagates outward from the source in a spherical wavefront. If the EM wave travels long enough so that expansion doubles its wavelength, is that 1 second burst received as a 2 second burst? Has the total energy of the EM wave as a whole been reduced by redshift, or has it simply been spread out over time/space?
I assume that expansion has not only increased the wavelength, but it has also increased the diameter of the wavefront as well, correct? (Diameter meaning distance between two points of the wave traveling in opposite directions)
I assume that expansion has not only increased the wavelength, but it has also increased the diameter of the wavefront as well, correct? (Diameter meaning distance between two points of the wave traveling in opposite directions)