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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The Answer of 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.

In the Figure Below, Three Identical Photons Were Each Emitted