USAAAO 2022, I кръг — Задача 27
USAAAO 2022 - First Round · 5 февруари 2022 г.
Условие
An astronomer observes a galaxy in very foggy weather. So far, she has an image of signal-to-noise ratio of approximately 1, imaging for about 5 seconds. if she wants to reach a signal-to-noise ratio of 10. How long, in total, must she observe the galaxy for?
(a) 15 seconds
(b) 20 seconds
(c) 25 seconds
(d) 50 seconds
(e) 500 seconds
Отговори
- E
Решение
Signal-to-noise ratio scales with the square root of time, so she would need 100 times more time to reach a 10 times greater signal-to-noise ratio. Hence, the answer is 500 seconds.
Answer: E
Оригинал в Архива: usaaao_first_exam_2022_problems.pdf · официални решения: usaaao_first_exam_2022_solutions-1.pdf