The Redshift of the Quasar Cygnus a Is About 0

question 98

Multiple Choice

The redshift of the quasar Cygnus A is about 0.046. In the spectrum of this quasar what is the wavelength of the H_α line in the hydrogen spectrum (in nanometers) ? The rest wavelength of the H_α line is 656.3 nanometers.

• A) 30.2
• B) 626.1
• C) 656.3
• D) 686.5