A Photon Escaping from a Large Mass Is Gravitationally Redshifted

question 68

Multiple Choice

A photon escaping from a large mass is gravitationally redshifted.What happens to the color of an object falling toward a black hole (observed from far away) ?

• A) The color of the object will be blueshifted.
• B) The color of the object will remain unchanged.
• C) The color of the object will be redshifted because the photons reaching our eyes are escaping the vicinity of the black hole.
• D) As the object accelerates toward the black hole, moving faster and faster, the idea of color ceases to have meaning as the photons shift from visible violet to ultraviolet and then X-rays and gamma rays.

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Definitions:

Outcome

The result or effect of an action or experiment.

Addition Rule

Combined probability of mutually exclusive outcomes is the sum of the individual probabilities.

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Probability

A measure of the likelihood of a specific event occurring, typically expressed as a value between 0 and 1.