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kosmologi - hubble relation
A hypothesis once used to explain the hubble relatoion is the "tired light hypothesis". the tired light hypothesis states that the universe is not expanding, but that photons simply lose energy as they move through space (by some unexplained means), with the energy loss per unit distance being given by the law:
dE/Dr=-KE
where K is a constant. show that this hypothesis gives a distance-redshift relation that is linear in the limit z<<1. what must the value of K be in order to yield a hubble constant og Ho = 70 km s¯¹ mpc¯¹?
Svar #1
21. april 2010 af peter lind
Brug at energien af en foton er h*c/λ hvor h er Plancks konstant, c er lyshastigheden og λ er bølgelængden
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