The term "cosmic distance ladder" refers to the fact(s) that:
Select the ones that apply:
a. change in apparent position of object on sky through Earths orbit, which gives a measure of distance. (p=1/D)
b. Spectral classification of star, which gives luminosity.D*=Sq rt L/4pieB
c. variable stars whose luminosity is related to their period.D*=Sq rt L/4pieB
d. relation between a galaxy's rotation rate and luminosity. D*=Sq Rt Lg/4pieBg
e. Exploding star whose luminosity can be determined by its light curve. Dg=SqRt Lsn/4pieBsn
f. Relation between galaxies recession velocity and distance.D=V/H
g. All of the above facts.
Answer is g. All of the above facts.
Rationale: Extragalactic distance scale (cosmic distance ladder) is the succession of methods by which astronomers determine the distances to celestial objects.
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What will be an ideal response?
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