USAAAO 2015, I кръг — Задача 16
USAAAO First Round 2015
Условие
A and B, two main sequence stars of the same spectral class, have apparent magnitudes of 17 and 12, respectively. If star A is 1 kpc away, what is the distance to star B?
a. 10 pc.
b. 100 pc.
c. 10 kpc.
d. 50 pc.
e. 100 kpc.
Отговори
- b
Решение
Answer: b
Оригинал в Архива: 2015-first-round-exam.pdf · официални решения: 2015-first-round-solutions.pdf