An emission line with a wavelength of 7294 A is seen in the spectrum of a distant galaxy and is identified as the Ly line

An emission line with a wavelength of 7294 Å is seen in the spectrum of a distant galaxy and is identified as the Lyα line of Hydrogen with a rest wavelength of 1215.67 Å.

a. The redshift is defined as the fractional change in wavelength. What is the redshift of this galaxy?

b. How much smaller was the scale size of the universe when the light from this galaxy was emitted?

c. When the light was emitted, was the universe expanding faster or slower than it is now? Explain.