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A Cepheid Variable Star Is Seen to Vary Regularly with a Period

Question 27

Multiple Choice

A Cepheid variable star is seen to vary regularly with a period of 25 days. How many times more luminous than the Sun would this star appear to be if it were to replace the Sun in our solar system? (See Figure 22-4 of Universe, 11th ed.)
A Cepheid variable star is seen to vary regularly with a period of 25 days. How many times more luminous than the Sun would this star appear to be if it were to replace the Sun in our solar system? (See Figure 22-4 of Universe, 11th ed.) ​ A) 4 B) 10,000 C) 1000 D) 100 ​


A) 4
B) 10,000
C) 1000
D) 100

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