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Show that the Planck blackbody spectrum reduces to the Rayleigh-Jeans formula in the limit of low frequencies. (10%).
Why do books say that the farthest galaxies we can see in opposite directions are not within each other's visible universe, when Einstein's addition of velocities law shows that any two velocities add up to a velocity less than that of light?
Show that for non-relativistic velocities v << c it is z =v=c, that is, the redshift for"nearby" astrophysical objects is directly related to the velocityof the object itself.