USAAAO 2015, Пробен кръг — Задача 19

USAAAO Practice Round 2015

Бележка

This round consists of 20 multiple-choice problems to be completed in 50 minutes. You may only use a scientific calculator and a table of constants during the test.

Условие

The peak wavelength of radiation from a certain star is 644 nm. If the absolute magnitude of this star is -0.17, what is its radius?

a. 13.4 solar radii

b. 16.5 solar radii

c. 17.8 solar radii

d. 19.8 solar radii

e. 20.5 solar radii

Отговори

Решение

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Оригинал в Архива: 2015-practice-round-exam.pdf · официални решения: 2015-practice-round-solutions.pdf