USAAAO 2018, I кръг — Задача 13
USAAAO National Astronomy Olympiad First Round 02/12/2018-02/16/2018 Time Limit: 75 Minutes · 12 февруари 2018 г. · 1 т.
Внимание: Бележка към темата
The solutions document provides answer letters for all 30 problems and brief explanations for some problems.
Условие
Star A has a surface temperature of 10,000 K while Star B has a surface temperature of 4,000 K. Star B is 10 times larger than Star A and its distance from Earth is half that of Star A. What is the magnitude difference between Stars A and B?
A. -10.48
B. -7.47
C. -0.48
D. 2.53
E. 7.47
Решение
Answer: D
Оригинал в Архива: usaaao-first-round-exam-2018.pdf · официални решения: usaaao_first_round_2018.pdf