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提问人:网友shineleeli 发布时间:2022-01-07
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Light travels at a speed which is about a million times faster than the speed of sound. In

one second, light travels about 300,000km. But sound travels only 344m. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke comes from his gun before the sound reaches your ears.

This great speed of light gives us some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light left the moon 1.3 seconds before it reached you. The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute. In some case, the light from one of tonight's stars started on its journey to you before you were bola.

Thus, if you want to be honest, you cant say" The stars are shining to night"? You have to say "The stars look pretty. They were shining four years ago but their light has just reached Earth".

Sunlight seems to ______ than the light of the moon.

A.have to travel a greater distance

B.move less quickly

C.travel much quickly

D.be less powerfull

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更多“Light travels at a speed which is about a million times faster than the speed of sound. In”相关的问题
第1题
It can be inferred from the passage that the Sun's light travelsA.through solid objects in

It can be inferred from the passage that the Sun's light travels

A.through solid objects in space

B.in many different directions

C.more slowly than scientists previously believed

D.further in summer than in winter

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第2题
A. electromagnetic energyB. electromagnetic energy travels through spaceC. came from the s

A. electromagnetic energy

B. electromagnetic energy travels through space

C. came from the sun

D. when a change in the nucleus of an atom takes place

E. when the sunrays are fierce

F. chemical energy is generated

Visible light that produce warmth is an example of ______.

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第3题
听力原文:Light travels at a speed that is about a million times faster than the speed of s

听力原文: Light travels at a speed that is about a million times faster than the speed of sound. In one second, light travels about 300, 000 km, but sound travels only about 334 meters. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke come from his gun before the sound reaches your ears.

This great speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays left the moon 1.3 seconds before they reached you. The nearest star is so far away that the light that you can see from it tonight started to travel towards you about four years ago at a speed of nearly 20 million km per minute. In some cases, the light from one of tonight's stars started on its journey to you before you were born. Thus, if we want to be honest, we cannot say, "the stars are shining tonight.” We have to say, "the tars look pretty. They were shining four years ago, but their light has only just reached the earth."

(30)

A.Light speed is millions of times faster than sound speed.

B.Light speed is a million times slower than sound speed.

C.Light speed is about millions of times faster than sound speed.

D.Light speed is about a million times faster than sound speed.

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第4题
完成下列各题 B Light travels at a speed which is about a million
times faster than the speed of sound.In one second,light travels about 300,000km.But sound travels only 344m.You can get some idea of this difference by watching the start of a race.If you stand some distance away from the starter,you can see smoke comes from his gun before the sound reaches your ears. This great speed of light gives US some strange facts.Sunlight takes about 8 minutes to reach US.If you look at the light of the moon tonight,remember that the light left the moon 1.3 seconds before it reached you.The nearest star is so far away that the light which you can see from it t0—night started to travel towards you four years ago at a speed of nearly 2 million km per minute.In some case,the light from one of tonight’s stars started on its journey to you before you were born. Thus,if you want to be honest,you cant say“The stars are shining to night”?You have to say“The stars look pretty.They were shining four years ago but their light has just reached Earth”. Sunlight seems to________than the light of the moon.

A.be less powerfull

B.travel much quickly

C.move less quickly

D.have to travel a greater distance

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第5题
In addition to his theory of color, Newton developed a theory of how light travels, This i
s known as the corpuscular theory of light, meaning that light travels as a series of tiny bits rather than in continuing waves. Newton sent his writings to the Royal Society, where they were given to a committee led by Hooke. Since the corpuscular theory was different from Ids own theory, Hooke attacked the paper. Soon others started to argue, and Hooke was supported by a scientist from Holland, Christian Huygens. At one time, Newton was so unhappy with tile whole affair that he decided never again to publish any of Ids works.

The bitter argument continued over the years that followed. At first, Hooke and Huygens received most of the support, Later, after Newton had changed ids mind and let Ids work on gravity be published, he became so famous that things changed. Now people believed Newton could do nothing wrong, and for a hundred years they followed his theory. Then, in the early part of the 19th century, the experiments of a French scientist, Augustin Fresnel, showed that light could be explained best by a wave theory. So the scientists changed sides again, saying that Newton's ideas had delayed scientific progress for a hundred years.

Strangely enough, rite presently-accepted theory of light combines some of the ideas of both theories. This is known as the quantum theory and results from the work of such 20th century scientists as Albert Einstein and Max Planck. The quantum theory assumes that light is given off as separate " packages" of energy. Each "package" travels out in a fixed pattern or wave form. These "packages" of light, or quanta of energy, as they are called, are given off at such a rapid rate that there is no great gap between them.

The quantum theory seems to explain the actions of light better than either of the two earlier theories. However, for many purposes, the wave theory is good enough. So it is used most often to explain light. But who is to say that new experiments and other scientists of our own time or in the future may not provide an even better theory? There is certainly still much work to be done with light and color.

From this passage it seems that ______.

A.Newton was not a successful scientist until he published his works

B.Newton was a scientist with at least three theories

C.Newton's theory was not accepted because Hooke did not approve it

D.Newton did not publish his theories because he was too disappointed

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第6题
In many stories on TV and in science-fiction books, men travel to faraway stars. They have
quick, easy journeys. But so far, men have been able to reach only the earth's own moon.

Suppose a man wanted to reach a distant star. Even if he traveled his whole life, he would have to move faster than the speed of light. Nothing can move that fast except light itself.

Strange things happen to an object when it moves rapidly. The object weighs more. An object moving at 86 percent of the speed of light is twice as heavy as it is at rest. A stick appears shorter. A clock runs more slowly. A man would not age so fast as he would on the earth.

Light travels more than 186, 000 miles a second, or about 11 million miles a minute. In one year, light travels six trillion(万亿) miles. That great distance is called a light-year. It is used to measure distances in space.

The star closest to our sun is Alpha Centrauri (半人马座a星). It is more than four lightyears away. If one traveled at the speed of light, he could make a round trip to Alpha Centauri in nine years. But, even at that speed, he could not reach Alcaid (北斗星)in the handle of the Big Dipper. A one-way journey to Alcaid would take almost 200 years!

Why do we measure the distance in light-years instead of miles?

A.Units of light-years sound better.

B.Using light-years reduced the number of figures used.

C.We used to measure distance in light-years long ago.

D.We do not make mistakes when we use light-years.

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第7题
Light travels much faster than light.()
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第8题
The professor said, " Light travels much faster than sound." The professor said that light __________ much faster than sound.
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第9题
Don’t make any ! The girl has a beautiful . Light travels much faster than . ()
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