A Classical Cepheid Variable Star Is Seen to Vary Regularly

question 50

Multiple Choice

A classical Cepheid variable star is seen to vary regularly with a period of 25 days.How many times brighter than the Sun would this star appear to be if it were to replace the Sun in our solar system? (See Figure 13-3 of Comins,Discovering the Essential Universe,6th ed.)

• A) 1000
• B) 4
• C) 10,000
• D) 10²

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