According to general relativity, a photon emitted by a star
A)loses energy.
B)reduces in frequency.
C)is red-shifted.
D)all of the above
E)none of the above

Question

Quizplus · Accepted Answer

All of the choices describe the gravitational redshift effect predicted by general relativity, where photons lose energy and decrease in frequency as they escape a gravitational field, leading to a redshift.

According to General Relativity, a Photon Emitted by a Star