Sagot :
Wavelength observed from Earth = 434nm(λₙ)
Wavelength observed after shift = 510nm(λ₀)
(b) Given, v=HR
R=Distance from Earth to quasar
H=Hubble Constant=22×[tex]10^{-3}m/(s,ly)[/tex]
V=Velocity of quasar
from above V=5.25×[tex]10^{7} m/s[/tex]
∴R=[tex]\frac{V}{H} =\frac{5.25*10^{7} }{22*10^{-3} }=0.24*10^{10} ly[/tex]
R=0.24×[tex]10^{10}ly[/tex], ly=Light year
How did Hubble demonstrate the vast distance between galaxies?
- Hubble's brilliant discovery was that the red shift of galaxies was proportional to their distance from Earth. That meant that objects farther from Earth were moving faster.
- In other words, the universe must be expanding. Hubble discovered Cepheid variable stars in the Andromeda Nebula, a well-known spiral, in 1923.
- Hubble was able to determine the distance of the nebula by using the relationship between the period of the Cepheid fluctuations and its luminosity.
- Surface brightness fluctuations (SBF) and the colour of a galaxy can be used by astronomers to calculate how far away it is from Earth. The majority of galaxies measured in this manner are millions of light years away.
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