Multiple Choice
In the figure below, three identical photons were each emitted when their local scale factor was RU =0.5.Each is then measured after the scale factor of the universe changes to a different amount, as shown.Which photon will be measured to have the greatest energy?
A) the one at RU =1
B) the one at RU = 2
C) the one at RU =3
D) The photons at RU= 2 and 3 will have identical energy.
E) All three will have the same energy.
Correct Answer:

Verified
Correct Answer:
Verified
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