How is a light photon affected by Gravity?


How is a light photon affected by Gravity? Without invoking General Theory of Relativity, we can use an alternate method to see how the energy of a light photon is affected by gravitational field. Since light has Energy, by virtue of Mass-Energy Equivalence Principle, therefore light has ‘mass’ due to its Energy. This mass can experience gravity.

When such a photon is moving upwards, it will loose Energy and thus its frequency will reduce.
When light escapes the gravitational pull of a massive star, its frequency is considerably reduced (for visible radiation, it’s shifted towards the red end of the spectrum). This phenomenon is known as Gravitational redshift.

About agogo22

Director of Manchester School of Samba at http://www.sambaman.org.uk
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