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MCQIntermediateStars & Stellar Evolution

USAAAO — 2020 First Round

Question 13

The angular diameter of star A with apparent bolometric magnitude 2 is 2.5 times greater than the angular diameter of star B with apparent bolometric magnitude 7. What is the ratio of the temperature of star A to that of star B?

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Source

Source: USAAAO 2020 First Round, Question 13.