If the Hubble constant has a value of 100 km s−1 Mpc−1 calculate the distance to the galaxy in Mpc.? - should i get an mpc 100 or ableton live
A few spectral line of hydrogen has been measured at a wavelength of 434.2 nm, in the laboratory. In the spectrum of a particular distant galaxy, the spectral line has a wavelength of 455.9 nm
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Friday, January 29, 2010
Should I Get An Mpc 100 Or Ableton Live If The Hubble Constant Has A Value Of 100 Km S−1 Mpc−1 Calculate The Distance To The Galaxy In Mpc.?
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Hello,
ReplyDeleteYou need the Hubble law:
d = cz/H_0
d = distance of the galaxy
c = speed of light
Redshift z =
H 0 = Hubble costante
The offset is defined as
z = (lamda_o, lamda_l) / lamba_l
lamda_o observation wavelength =
lamda_l = wavelength measured in the laboratory
Where
z = (455.9-434.2) / 434.2 = 0.0500
Thus, the distance:
d = cz/H_0 = 150Mpc
Bye!