What happens to the wavelength of light as it travels outward through the gravitational field of a planet or star so that the field becomes less strong?
A) The wavelength stays the same, but the intensity of the light decreases.
B) The wavelength decreases.
C) The wavelength stays the same, but the energy of each photon decreases.
D) The wavelength increases.

Question

Quizplus · Accepted Answer

As light escapes a gravitational field, its wavelength increases, a phenomenon known as gravitational redshift. This occurs because the light loses energy overcoming the gravitational pull, resulting in an increase in wavelength.

What Happens to the Wavelength of Light as It Travels