ThewaveswerepredictedaspartofEinstein'sgeneraltheoryofr...
問題詳情:
The waves were predicted as part of Einstein's general theory of relativity nearly 100years ago.It was the theory of the physics behind the workings of our world and the universe.
The idea was that the waves are like waves in space,caused by some of the violent and energetic processes in the universe.For example,two black holes crashing into each other.
Now a group of scientists,including ones from Caltech,MIT and the LIGO Scientific,Collaboration finally found the gravitational waves.
David Reitze is the executive director of the LIGO observatory at Caltech.
"We have detected gravitational waves.We did it!"
What are these gravitational waves?
Well,imagine throwing a rock into a pond.When the rock hits the flat surface of the water,it creates waves.Space﹣time is like the surface of the water.So that means gravitational waves are like the waves moving out from where the rock hits the water.
It might be hard to understand,but those gravitational waves expand and contract space and time as they move through space.And when they get to the Earth,the waves pass through,and they contract and expand the planet as the waves go by.
It was Einstein who said these gravitational waves should be observable.
But these are not huge waves.They are very,very small,which is why it took so long to find them.You cannot see them with your eyes.They are smaller than the size of an atom.
How did the scientists find them?
They used a giant scientific tool called LIGO,which stands for the Laser Interferometer Gravitational﹣Wave Observatory.The billion﹣dollar LIGO project is two L﹣shaped observatories.One is in Louisiana and the other in Washington state.
For years,scientists have been watching two black holes in another faraway galaxy.The two were spinning around each other,moving closer and closer together.When they finally crashed into each other,it was with such power and force that gravitational waves rang throughout the universe,like a giant bell.
Those waves,traveling at the speed of light,finally reached the Earth,some l.3billion years later.They are the same waves that the scientists announced this past week.
So,what does this discovery mean?
Our understanding of the heavens changed dramatically.
1.What are gravitational waves about?
A.About the workings of the universe。
B.About how black holes form.
C.About how the universe began.
D.About how the waves form on the surface of water.
2.The underlined sentence"two black holes crashing into each other"is used to express .
A.how the universe begins to exist
B.how gravitational waves form
C.how new black holes appear
D.how the earth is affected
3.Why are gravitational waves difficult to find?
A.Because they are too small.
B.Because they are far away.
C.Because they seldom occur.
D.Because they have disappeared.
4.With the discovery of gravitational waves,we'll .
A.create a new world
B.make full use of gravitational waves
C.understand the universe in a new way
D.avoid being hit by black holes.
【回答】
1. A.細節理解題.根據第二段中It was the theory of the physics behind the workings of our world and the universe這是我們宇宙和宇宙運行背後的物理學理論.可知"引力波"是關於宇宙的運作.故選項A正確.
2.B.細節理解題.根據本段caused by some of the violent and energetic processes in the universe由宇宙中一些*和充滿活力的過程引起的.一句可知這個例子主要是介紹引力波形成的原因.故*選B.
3.A.細節理解題.根據文中They are very,very small,which is why it took so long to find them它們非常非常小,這就是為什麼花了這麼長時間才找到它們的原因.可知引力波很小.故*A正確.
4.C.細節理解題.根據最後一句Our understanding of the heavens changed dramatically我們對天空的認識發生了巨大的變化.可知我們將以全新視角理解這個世界.故*C正確.
【點評】閲讀題型,要注重句子與句子之間、段落與段落之間邏輯關係以及對篇章的整體理解.根據所給問題選擇正確選項完成試題.
知識點:日常生活類
題型:閲讀理解
-
下列説法正確的是 A.物質發生化學反應都伴隨着能量變化B.伴有能量變化的物質變化都是化學變化C.在一個確...
問題詳情: 下列説法正確的是 A.物質發生化學反應都伴隨着能量變化B.伴有能量變化的物質變化都是化學變化C.在一個確定的化學反應關係中,反應物的總能量總是高於生成物的總能量D.放熱反應的發生無需任何條件【回答】A知識點:化學反應中的能量變化題型:選擇題...
-
______clevertheboyis! A.How ...
問題詳情:______clevertheboyis! A.How B.What C.Whata【回答】A知識點:感歎句題型:選擇題...
-
下列與實驗相關的敍述正確的是 A.稀釋濃硫*時,應將蒸餾水沿燒杯內壁緩慢地注入濃硫*中B.配製溶液時,若加水...
問題詳情:下列與實驗相關的敍述正確的是 A.稀釋濃硫*時,應將蒸餾水沿燒杯內壁緩慢地注入濃硫*中B.配製溶液時,若加水超過容量瓶刻度,應用膠頭滴管將多餘溶液吸出C.配製1mol·L-1300mLNaCl溶液可以選擇一個50mL的容量瓶和一個250mL的容量瓶D.可以用右圖裝置進行*氣的...
-
(2010·福建高考)入海河流三角洲的土地利用類型受河流淡水和海洋鹹水的共同影響。某三角洲面積增長較快,該三...
問題詳情: (2010·福建高考)入海河流三角洲的土地利用類型受河流淡水和海洋鹹水的共同影響。某三角洲面積增長較快,該三角洲地區2007年土地利用類型的構成如下表所示。讀表,完成11~12題。旱地林草地鹽荒地灘塗其它合計佔總面積比例(%)171232182110011.該三角洲地...
相關文章
- 單項選擇。WheneverMaryreadsaninterestingstory,shecan'tkeepit...
- Ifoverweightpeopleeatlessandtakemoreexercise,they’llso...
- Nuclearpower's(核能的)dangertohealth,safety,andevenlifeits...
- 單項選擇。WheneverMaryreadsaninterestingstory,shecan'tkeepit...
- You'veseenpeopleinneedonthenewsafterahurricane,anearthq...
- 單項選擇。WheneverMaryreadsaninterestingstory,shecan'tkeepit...
- ---Thestudentslookverytiredafterthesportsmeeting.---We...
- Peter'sjobwastoexaminecarswhentheycrossedthefrontier(邊境...
- 單項選擇。WheneverMaryreadsaninterestingstory,shecan'tkeepit...
- 七選五閲讀There'splentyofadviceoutthereaboutwhattodotogettos...