Suppose the X-Ray Signal from a Quasar Fluctuates with a Period

question 396

Multiple Choice

Suppose the X-ray signal from a quasar fluctuates with a period of three hours.What is the MAXIMUM size of the source?

• A) 150,000 km, about the diameter of Jupiter
• B) 10.8 AU, about the diameter of Jupiter's orbit
• C) 4.5 ly, about the distance between the Sun and the nearest star
• D) 10,800 ly, one-tenth the size of the Milky Way Galaxy

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