In the Figure Below, Three Identical Photons Were Each Emitted

question 53

Multiple Choice

In the figure below, three identical photons were each emitted when their local scale factor was R_U =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 R_U =1
• B) the one at R_U = 2
• C) the one at R_U =3
• D) The photons at R_U= 2 and 3 will have identical energy.
• E) All three will have the same energy.

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