An absorption line of the element beryllium is observed in the spectrum of the galaxy above as lying 509.4 nm. What is the speed of the recession of the galaxy in km s^1 assuming that the speed of light is c = 3.00 x 10^5 km s^-1
And what is the value of the Hubble Constant?
(1) L = 6.6 * 10^39 W, b = 1.25 * 10^-11 W/m^2
b = L / (4 * pi * d^2)
4 pi d^2 = L / b
d^2 = L / (4 pi b)
d = sqrt [L / (4 pi b)]
d = sqrt [6.6 * 10^39 / (4 * pi * 1.25 * 10^-11)] = 4.20 * 10^49 m
Since 1 Mparsec = 3.262 * ...
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