On the Basis of the Distance to the Coma Cluster $\alpha$

Multiple Choice

On the basis of the distance to the Coma Cluster of galaxies (90 Mpc) and the Hubble relation, using for the Hubble constant H₀ the value 73 km/sec per million pc, what would be the approximate wavelength shift of the Balmer H $\alpha$ spectral line at 656.3 nm emitted by a galaxy in the cluster because of the general expansion of the universe? (See Box 23-2, Universe, 11th ed.)

A) 1.44 × 10^-2 nm
B) 2.87 × 10^-3 nm
C) 143.7 nm
D) 14.4 nm