“2018年IOAA理论第6题-用FAST观测太阳”的版本间的差异
（创建页面，内容为“{{需要解答}} ==英文题目== '''(T6) Observe the Sun with FAST (25 points)''' The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is a single-dish…”） |
|||
| 第2行： | 第2行： | ||
==英文题目== | ==英文题目== | ||
'''(T6) Observe the Sun with FAST (25 points)''' | '''(T6) Observe the Sun with FAST (25 points)''' | ||
| + | |||
The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is a single-dish radio telescope located in Guizhou Province, China. The physical diameter of the dish is 500 m, but during observations, the effective diameter of the collecting area is 300 m. | The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is a single-dish radio telescope located in Guizhou Province, China. The physical diameter of the dish is 500 m, but during observations, the effective diameter of the collecting area is 300 m. | ||
| + | |||
Consider observations of the thermal radio emission from the photosphere of the Sun at 3.0 GHz with this telescope and a receiver with bandwidth 0.3 GHz. | Consider observations of the thermal radio emission from the photosphere of the Sun at 3.0 GHz with this telescope and a receiver with bandwidth 0.3 GHz. | ||
| + | |||
(a) Calculate the total energy (E<sub>⊙</sub>) that the receiver will collect during 1 hour of observation. | (a) Calculate the total energy (E<sub>⊙</sub>) that the receiver will collect during 1 hour of observation. | ||
| + | |||
(b) Estimate the energy needed to turn over one page of your answer sheet (E′). Hint: the typical surface density of paper is 80 gm<sup>-2</sup>. | (b) Estimate the energy needed to turn over one page of your answer sheet (E′). Hint: the typical surface density of paper is 80 gm<sup>-2</sup>. | ||
| + | |||
(c) Which one is larger? | (c) Which one is larger? | ||
==中文翻译== | ==中文翻译== | ||
'''(T6) 用FAST观测太阳 (25分)''' | '''(T6) 用FAST观测太阳 (25分)''' | ||
| + | |||
五百米口径球面射电望远镜（FAST）是坐落于中国贵州省的单口径望远镜。望远镜的直径是500m，但在观测时的有效接受区域直径300m。 | 五百米口径球面射电望远镜（FAST）是坐落于中国贵州省的单口径望远镜。望远镜的直径是500m，但在观测时的有效接受区域直径300m。 | ||
| + | |||
考虑使用FAST观测来自太阳光球层的热辐射，中心频率3GHz，带宽0.3GHz。 | 考虑使用FAST观测来自太阳光球层的热辐射，中心频率3GHz，带宽0.3GHz。 | ||
| + | |||
(a) 计算1小时观测能接收到来自太阳的总能量。 | (a) 计算1小时观测能接收到来自太阳的总能量。 | ||
| + | |||
(b) 估计将一张试卷翻面需要的能量。提示：典型的纸张面密度为80 gm<sup>-2</sup>。 | (b) 估计将一张试卷翻面需要的能量。提示：典型的纸张面密度为80 gm<sup>-2</sup>。 | ||
| + | |||
(c) 哪个能量更大？ | (c) 哪个能量更大？ | ||
[[分类:射电望远镜]] | [[分类:射电望远镜]] | ||
2019年7月24日 (三) 13:05的版本
|
|
本题目目前没有解答。要不要你来试试！ |
英文题目
(T6) Observe the Sun with FAST (25 points)
The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is a single-dish radio telescope located in Guizhou Province, China. The physical diameter of the dish is 500 m, but during observations, the effective diameter of the collecting area is 300 m.
Consider observations of the thermal radio emission from the photosphere of the Sun at 3.0 GHz with this telescope and a receiver with bandwidth 0.3 GHz.
(a) Calculate the total energy (E⊙) that the receiver will collect during 1 hour of observation.
(b) Estimate the energy needed to turn over one page of your answer sheet (E′). Hint: the typical surface density of paper is 80 gm-2.
(c) Which one is larger?
中文翻译
(T6) 用FAST观测太阳 (25分)
五百米口径球面射电望远镜（FAST）是坐落于中国贵州省的单口径望远镜。望远镜的直径是500m，但在观测时的有效接受区域直径300m。
考虑使用FAST观测来自太阳光球层的热辐射，中心频率3GHz，带宽0.3GHz。
(a) 计算1小时观测能接收到来自太阳的总能量。
(b) 估计将一张试卷翻面需要的能量。提示：典型的纸张面密度为80 gm-2。
(c) 哪个能量更大？
