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A light signal is sent from Earth to a satellite. Will there be any frequency change when it is received on satellite?

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Question

A light signal is sent from Earth to a satellite. Will there be any frequency change when
it is received on satellite?

Expert Solution

Introduction:

The speed of light is the cosmic speed limit. Nothing with mass can reach the speed of light. Thus, when a photon loses energy to maintain a constant speed, they change frequency which changes wavelength.

As per general relativity when light moves in a gravitational field caused by a massive object the photons must expend some energy.

This causes a frequency shift depending on whether the photon moves toward the source or away from it.

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