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2亿+学生的选择
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2亿+学生的选择
天空为什么是蓝色的 我们的科学作业 要英文的 最好配图
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2亿+学生的选择
Why&is&the&sky&blue?&A&clear&cloudless&daytime&sky&is&blue&because&molecules&in&the&air&scatter&blue&light&from&the&sun&more&than&they&scatter&red&light.& When&we&look&towards&the&sun&at&sunset,&we&see&red&and&orange&colours&because&the&blue&light&has&been&scattered&out&and&away&from&the&line&of&sight.&The&white&light&from&the&sun&is&a&mixture&of&all&colours&of&the&rainbow.& This&was&demonstrated&by&Isaac&Newton,&who&used&a&prism&to&separate&the&different&colours&and&so&form&a&spectrum.& The&colours&of&light&are&distinguished&by&their&different&wavelengths.& The&visible&part&of&the&spectrum&ranges&from&red&light&with&a&wavelength&of&about&720&nm,&to&violet&with&a&wavelength&of&about&380&nm,&with&orange,&yellow,&green,&blue&and&indigo&between.& The&three&different&types&of&colour&receptors&in&the&retina&of&the&human&eye&respond&most&strongly&to&red,&green&and&blue&wavelengths,&giving&us&our&colour&vision.
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Why&the&sky&is&blueWe&see&the&sky,&is&often&sky&blue,&especially&after&a&heavy&rain,&the&sky&is&blue&like&a&limpid&eyes,&relaxed&and&happy&making&a&person,&mencius.it&describes&how&to&fly.&Why&the&sky&is&blue?Atmospheric&itself&is&colorless.&The&sky&is&blue&air&molecules,&ice&crystals&and&water&droplets,&etc&and&sunshine&common&creation&picture.Sunshine&into&the&atmosphere,&longer-wavelength&color,&such&as&red,&transmission&power,&you&can&through&the&air&into&the&&And&wavelength&short&purple,&blue,&blue&light,&encounter&atmospheric&molecules,&ice&crystals&and&water&droplets,&and&so&on,&it&is&easy&to&happen&scattering&phenomenon.&Be&scattering&of&violet,&blue,&blue&light&is&full&of&the&sky,&and&makes&the&sky&appear&a&piece&of&the&blue.A:&why&is&the&sky&blue,&not&green&or&red?First&you&have&to&understand&a&truth:&we&all&the&things&around&them&are&showing&color&to,&simply&because&the&sun&beat&down&on&the&them.&Although&the&sun&looks&is&white,&but&all&colors:&red,&orange,&yellow,&green,&blue,&blue,&purple,&in&sunshine&in.In&the&sky&there&are&so&many&colors,&why&do&I&usually&see&is&blue?&You&might&ask.If&you&put&the&light&idea&for&wave,&you'll&guess&broken&this&mystery.&Light&is&actually&like&a&wave&that&in&the&movement.&We&suppose&a&drop&of&rain&fell&in&a&ponding&in&the&scene.&When&this&drop&of&rain&fell&on&the&surface,&can&produce&small&waves,&the&waves&move&up&and&down&to&become&more&laps,&to&spread&out&in&all&directions.&If&these&waves&with&a&small&pebble&or&a&what&other&obstacles,&they&will&bounce&back,&changed&the&direction&of&the&waves.While&the&sun&shone&from&the&sky,&and&will&continuously&met&some&of&the&obstacles.&Because&light&must&penetrate&air&is&not&empty,&it&consists&of&a&lot&of&a&lot&of&tiny&particles.&Ninety-nine&percent&of&them&is&not&nitrogen&is&oxygen,&the&rest&is&other&gas&particles&and&small&floating&particles,&from&automobile&exhaust,&factory&smoke,&forest&fire&or&volcanic&eruption&out&of&ash.&Although&oxygen&and&nitrogen&particles&is&just&a&drop&of&rain&one&over&one&million,&but&they&can&still&stop&sunshine&way.&The&light&from&many&of&those&little&&stumbling&block&&on&rebound,&nature&also&changed&his&direction.But&so&many&color&of&light&changed&direction,&why&only&blue&be&seen?&You&may&still&don't&understand.We&have&to&return&to&said&just&now&that&the&ponding.Ponding,&small&waves&meet&scree&of&words,&the&water&was&to&get&&But&if&it&is&a&&waves&,&as&you&hand&in&the&ponding&edge&lifted&the&sort&of&&waves&,&it&could&simply&from&stone&overflow&in&the&past,&and&unimpeded&to&reach&across&the&ponding&edge.&So,&like&a&great&wave&and&small&waves,&various&color&of&light&waves&also&have&different&&wave&,&that&is,&the&wavelength:&but&they&don't&like&the&water&wave,&is&with&the&naked&eye&can&not&see&the&size&of&them,&because&they&are&too&small&it&is&hard&to&imagine,&just&a&hair&one&over&one&hundred!&Have&to&very&sensitive&measuring&instrument&can&measure&out.According&to&scientists&determination,&blue&light&and&purple&light&wavelength&is&shorter,&is&equivalent&to&the&&small&wave&;&The&orange&ray&and&red&light&wavelength&comparison&is&long,&is&equivalent&to&the&&big&wave&.&When&the&air&barrier,&blue&light&and&purple&light&because&turn&over&the&obstacles,&was&&scattering&&are&all&over&the&place,&be&full&of&the&whole&sky&-&the&sky,&is&the&&scatter&&has&become&blue.Found&that&the&&scatter&&phenomenon&scientists&call&Rayleigh,&he&is&found&in&130&years&ago,&he&is&also&the&Nobel&Prize&winner.Use&&scattering&&phenomenon,&you&can&explain&these&signs:For&example,&in&you&top&of&head&of&the&sky&is&blue,&but&on&the&horizon&-&heaven&and&earth&conterminous&place,&the&sky&seems&almost&is&white.&Why?&It&is&because&the&sun&from&the&horizon&to&you&this&place&than&it&directly&from&the&air&down,&need&to&be&in&the&air's&journey&takes&much&longer&-&and&in&the&way&it&grazed&micro&particle&also&will&be&much&more&natural.&These&large&amounts&of&micro&particle&that&the&multiple&scattering&light,&so&it&appears&white&appearing&in&the&light&blue.&Suggest&you&do&a&small&experiment&to&verify&the:&take&a&cup&of&water,&put&it&on&a&dark&background,&in&a&drop&of&milk,&take&a&torch&exposure&at&the&end&of&the&cup,&and&close&to&it,&the&light&of&the&flashlight&in&the&water&will&immediately&appear&light&blue.&If&you&go&to&the&water&in&the&milk,&the&more&water&is&white,&because&light&over&and&over&again&by&the&numerous&milk&particle&scattering,&the&result&is&white.&Truth&in&the&horizon&with&above&is&white&as.As&the&sun&set&evening,&the&sky&do&not&appear&blue&and&red&appeared,&falling&sun&also&become&dark&red,&is&the&same&reason.&Because&the&evening&light&in&exposure&to&you&on&the&way&this&place&with&many&particles,&makes&the&sun's&purple&and&blue&part&to&all&directions&scattering&away,&leaving&behind&only&a&little&bit&of&make&your&naked&eye&visible&orange&red&light&-&because&their&wavelength&long,&&big&waves,&&over&the&obstacles&on&the&road.However,&careful&you&will&find,&there&is&a&after&in&the&sunset&will&also&present&in&a&period&of&dark&blue.&It&also&was&once&scientists&are&concerned&a&strange&thing&happened,&but&some&physicists&have&been&in&50&years&ago&opened&the&mystery:&cause&at&twilight,&the&sky&is&blue,&it&is&a&kind&of&special&material.&The&special&material&from&the&surface&of&the&earth&in&20&to&30&km&place&gathered&into&thick&a&plane,&so&that&the&ozone&layer.&The&gas&to&falling&sun&plays&like&color&filter&that&role:&it&intercepted&in&sunlight&yellow&and&orange&part,&but&almost&no&stop&to&let&the&blue&part&through.&When&the&last&a&little&light&disappeared,&all&the&color&before&it&disappeared&in&the&darkness&of&the&night.Ozone&not&only&results&in&the&evening&the&blue&sky,&but&also&to&swallow&a&kind&of&you&can't&see&the&special&light:&ultraviolet&light,&or&say&ultraviolet.&You&must&have&heard&of,&ultraviolet&ray&to&all&creatures&(of&course&also&included&for&you)&how&dangerous.&If&it's&on&your&bare&skin&irradiation&too&long,&you'll&have&to&sunburn.&The&ozone&layer&is&filled&with&enough&thickness&can&capture&as&many&ultraviolet:&this&for&our&planet's&all&life,&it&is&extremely&important.Unfortunately,&today,&this&life&important&protective&layer&in&many&places&have&thin,&
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2亿+学生的选择
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扫二维码下载作业帮
2亿+学生的选择
over head and ears 为什么是深陷于?
魔幻天影465
扫二维码下载作业帮
2亿+学生的选择
这个就像中文的说曹操,曹操到,并不是真的有曹操这个人来了这个是英文里的一个特色
那这个也有典故吗?
没有典故，就是一种用法，像英语里还有rain cats and dogs ，意思是下倾盆大雨。这样的还有很多，你可以通过电视剧，或者电影等看到。这种在生活中用的多，正式的场合不会用
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没过了头和耳朵, 当然是深陷了.
但真的很少听美国人这么说, 大概是英国的说法吧.
很多东西不能从字面上去翻译的。而且这些东西需要积累。祝LZ好运。比如：out of the blue? 是突如其来，而不是来自蓝色。。
回答, 我想要知道典故在哪里的
这个我就真不知道了。
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