Instructor key. Numeric values are generated by build_astr476_package.py from the computation module and the included source subset.
Solution 1
z=(510.0/500.0)-1=0.0200. The Doppler-only interpretation is only an approximation; cosmological expansion, peculiar motion, and line identification must be addressed.
Solution 2
c/H0=4447.959 Mpc; 1/H0=14.5073 Gyr. Age requires integrating the expansion history and assumptions about contents/curvature.
Solution 3
At low z, D_L approximately cz/H0; substitute in mu=5 log10(D_L/Mpc)+25. It fails when higher-order expansion terms and peculiar velocities matter.
Solution 4
z=300/299792.458={300/299792.458:.6f}. At comparable cz, peculiar velocities are not a small correction.