大师作文网我知道答案,请解释下为什么
来源：学生作业帮 编辑：大师作文网作业帮 分类：英语作业 时间：2024/11/10 16:29:37
我知道答案,请解释下为什么
1.a small particle of interplanetary material is heated by friction from 400k to 4000k as i falls into the atomosphere of earth nd produces a meteor in our sky.if this object behaves like a perfect blackbody over this short time,how dost its emitted radiation changes as it is heated?its meitted intensity rases by a factor of 10000,while its peak wavelength becomes shoter by a factor of 10,from infrared to red visible light.
2.spectral lines observed in the granules on the Sun's surface near the center of the Sun's disk:are blueshifted near the center of the granule and redshifted near the edge of the granule.
3.in the movie,"predator" the alien is invisble to human being,this is because:the alien must have masked its emission somehow so as to appear invisible to humans.
1.a small particle of interplanetary material is heated by friction from 400k to 4000k as i falls into the atomosphere of earth nd produces a meteor in our sky.if this object behaves like a perfect blackbody over this short time,how dost its emitted radiation changes as it is heated?its meitted intensity rases by a factor of 10000,while its peak wavelength becomes shoter by a factor of 10,from infrared to red visible light.
2.spectral lines observed in the granules on the Sun's surface near the center of the Sun's disk:are blueshifted near the center of the granule and redshifted near the edge of the granule.
3.in the movie,"predator" the alien is invisble to human being,this is because:the alien must have masked its emission somehow so as to appear invisible to humans.
第一题是这个意思：行星之间的物质坠入到地球大气,因为大气摩擦从400K被加热到4000K（K是开尔文,为表征温度的单位）从而发光成为流星,题目问的是假设它发出的光线为黑体辐射,那么它辐射出的光线随着它被加热是如何变化的?答案这样：根据黑体辐射满足的普朗克辐射定律B(λ,T)=2hc2 /λ5 ·1/exp(hc/λRT)-1,把温度的变化带入就可以求出辐射强度会增加,然后随温度增加辐射出的峰值波长逐渐变短,也就是从红外波段渐渐变成可见的红光!
第二题：太阳上的一些小面元靠近中心处相对于我们的速度是靠近的所以出现蓝移,而边缘处相对速度远离我们所以出现红移.
第三题：这个貌似是电影《铁血战士》里面的解释吧?就说它佩戴的东西让人类不可见呗!
累死了,第一次打这么多字.
第二题：太阳上的一些小面元靠近中心处相对于我们的速度是靠近的所以出现蓝移,而边缘处相对速度远离我们所以出现红移.
第三题：这个貌似是电影《铁血战士》里面的解释吧?就说它佩戴的东西让人类不可见呗!
累死了,第一次打这么多字.
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