Question 1 (1
point) If the inner accretion disk
around a black hole has
a temperature of 1 million K, at what wavelength will it radiate the most energy?
a.1 million nm b. 3 nm c. 3 million
nm d. 1 nm e.10 nm
Wien’s Law: λ = 3000000 nm K/T
λ = 3 nm (which is in
the X-rays)
Question
2 (1 point) If we take a spectrum of a quasar and see that the Lyman alpha line, observed in the laboratory
at a wavelength of 121.6
nm, appears at a wavelength of 425.6 nm, what is the redshift (z) of this quasar?
a. 0.5 b. 1
c. 1.5 d. 2 e. 2.5
z = Δλ/λ and λ = 121.6 nm and Δλ = 425.6 nm – 121.6
nm
so z = 304 nm /121.6 nm = 2.5