A. The antenna is vertically polarized to match the polarization of ship navigational radars. B. The antenna is horizontally polarized and omnidirectional. C. The antenna is circularly polarized to match the polarization of GPS. 相关知识点: 试题...
There are two sorts of radiation man must fear in space. The first is radiation from the sun, and this is particularly dangerous when the sun is very active and explosions are occurring on its surface. The second, less harmful form comes from the so-called Van Allen Belts. These are two...
What are the parts of waves? What are the types of Electromagnetic radiation? Radiation waves Waves One oscillation or cycle. Electromagnetic radiation (e.m.r.) travels in the form of waves. Draw and label these wave diagrams. One oscillation or cycle. Frequency is the number of cycles or ...
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The types and levels of risk associated with certain ranges of radiation dose are summarised from recommendations of the International Commission on Radiological Protection in 2007. There are estimates of threshold doses for various lethal radiation-induced syndromes, and for reactions in various tissues...
Thermal burns.Touching a very hot object raises the temperature of your skin to the point that your skin cells start dying. Very hot metals, scalding liquids, and flames all cause thermal burns. Steam can, too. Radiationburns.Sunburnis a type of radiation burn. Other sources of radiation, ...
The synchrotron radiation isn't just seen in radio waves, if the electrons are accelerated to high enough speeds, emissions are also seen in infrared, optical, ultraviolet light, and even in X-ray radiation. The radio wave emissions of radio lobes can be so powerful they can give off as ...
What are the different types of infrared waves?Infrared Radiation:Infrared radiation (IR), is electromagnetic radiation with wavelengths longer than those of visible light. It is generally invisible to the human eye. About half of the total energy from the Sun arrives on Earth in the form of ...
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What forms of radiation are feared by astronauts A.Radiation from the sun. B.Radiation from the Van Allen Belts. C.Radiation from the meteors. D.Both A and B. 该题目是单项选择题,请记得只要选择1个答案! 正确答案 点击免费查看答案 试题上传试题纠错 ...