An Astronomer Is Observing the Radiation from a Distant Active

question 32

Multiple Choice

An astronomer is observing the radiation from a distant active galaxy and notices that the amplitude of the signal varies in strength regularly over a certain period. The maximum possible size for the source of this radiation can now be calculated from the

• A) period and the amplitude of the signal.
• B) period but not the amplitude of the signal.
• C) amplitude but not the period of the signal.
• D) frequency of the radiation composing the signal.

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