2016年IOAA理论第5题-穿过GMRT波束 - 版本历史

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2019-09-12T17:11:38Z

翻译存疑

2019年9月11日 (三) 09:45 Quan787

2019-09-11T09:45:26Z

Quan787：创建页面，内容为“==英文题目== '''(T5) GMRT beam transit''' Giant Metrewave Radio Telescope (GMRT), one of the world's largest radio telescopes at metre wavelengths, is located i…”

2019-09-11T09:30:45Z

创建页面，内容为“==英文题目== '''(T5) GMRT beam transit''' Giant Metrewave Radio Telescope (GMRT), one of the world's largest radio telescopes at metre wavelengths, is located i…”

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==英文题目==
'''(T5) GMRT beam transit'''

Giant Metrewave Radio Telescope (GMRT), one of the world's largest radio telescopes at metre
wavelengths, is located in western India (latitude: 19°6′ N, longitude: 74°3′ E). GMRT consists of 30
dish antennas, each with a diameter of 45.0 m. A single dish of GMRT was held fixed with its axis
pointing at a zenith angle of 39°42′ along the northern meridian such that a radio point source would pass
along a diameter of the beam, when it is transiting the meridian.

What is the duration 𝑇<sub>transit</sub> for which this source would be within the FWHM (full width at half
maximum) of the beam of a single GMRT dish observing at 200 MHz?

'''Hint:''' The FWHM size of the beam of a radio dish operating at a given frequency corresponds to the
angular resolution of the dish. Assume uniform illumination.

[[分类:视运动]]

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	==英文题目==		==英文题目==
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 '''Hint:''' The FWHM size of the beam of a radio dish operating at a given frequency corresponds to the
 angular resolution of the dish. Assume uniform illumination.
 [[分类:视运动]]