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

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我知道答案,请解释下为什么1.asmallparticleofinterplanetarymaterialisheatedbyfrictionfrom400kto4000kasifallsintoth

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
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.

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
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.

I do not konw

这道题选A,为什么?请解释下BCD, 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 我知道答案,但是请解释一下为什么. 在100L空气里,氮气的体积约是A 78LB 78%我知道答案是A,请说明下理由,为什么不能用% 下列反应过程属于非自发过程的是A N2和O2的混合B常温常压下石墨转化为金刚石C H2和O2化合成H2OD C+O2=CO2请详细解释下原因,答案我已经知道,为什么A和D不是?他们不都是S减吗英语完型的几道问题请解释下38.39.41.43.44为什么不选我选的答案, 帮我解释下为什么选这个答案 sma a是什么意思啊解释下A为什么 If only I ____ (be) ten years younger!我知道答案是 were 为什么? 请哪位高手给解释解释.were不是are 的过去试吗? 关于C++类对象组的一个选择题.请帮我解释下原因,我知道答案是C.#includeusing namespace std;class Sample{public:Sample(){}Sample(){cout 请帮我解释下一个瓶子最多能装下100g水,则这个瓶子可以装下（）A100g硫酸 B100g汽油c100g酒精 D100g煤油我知道答案选A 可是为什么呢,请列出算式来请知道的朋友解释下, 知道者速回~帮我详细说明为什么选这个答案~别的答案也分析分析~如果有词组写出来解释下~(C) 1.If you don't want to go to the party ,you 'd better ( ) the invitation.A.accept B.decline C.refuse (C) 2.Collecting stamps Though ______money,his parents managed to send him to universuty A lacked B lacking ofc lacking d lacked in 答案选C、我选B、这时为什么呢、请详细解释下、谢了我最喜爱的水果是香蕉?用英语怎么解释,学用通上的答案是:My favorite fruit is bananas.书上还有My favorite movie is action movies.请帮我解释解释我要知道为什么 C语言的一道小计算题a=12;a+=a-=a*a 求a=?我知道答案=-264但我不知道怎么得出来的谁能给我一步一步解释下?