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An atom bomb would ____ a cityA.destroyB.damageC.spoilD.wreck

An atom bomb would ____ a city

A.destroy

B.damage

C.spoil

D.wreck

提问人：网友shapeguy 发布时间：2022-01-06

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更多“An atom bomb would ____ a city…”相关的问题

第1题

Fermi ProblemOn a Monday morning in July, the world’s first atom bomb exploded in the New

Fermi Problem

On a Monday morning in July, the world’s first atom bomb exploded in the New Mexico desert. Forty seconds later, the shock waves reached the base camp where the Italian-American physicist Enrico Fermi and his team stood. After a mental calculation, Fermi announced to his team that the bomb’s energy had equated 10,000 tons of TNT. The bomb team was impressed, but not surprised. Fermi’s genius was known throughout the scientific world. In 1938 he had won a Nobel Prize. Four years later he produced the first nuclear chain reaction, leading us into the nuclear age. Since Fermi’s death in 1954, no physicist has been at once a master experimentalist and a leading theoretician.

Like all virtuosos, Fermi had a distinctive style. He preferred the most direct route to an answer. He was very good at dividing difficult problems into small, manageable bits—talent we all can use in our daily lives.

To develop this talent in his students. Fermi would suggest a type of question now known as a Fermi problem. Upon first hearing one of these, you haven’t the remotest notion of the answer, and you feel certain that too little information had been given to solve it. Yet when the problem is broken into sub-problems, each answerable without the help of experts or books, you can come close to the exact solution.

Suppose you want to determine Earth’s circumference without looking it up. Everyone knows that New York and Los Angeles are about 3,000 miles apart and that the time difference between them is three hours. Three hours is one eighth of a day, and a day is the time it takes the planet to complete one rotation, so its circumference must be eight times 3,000 or 24,000 miles. This answer differs from the true value, 24,902.45 miles, by less than four percent.

Ultimately the value of dealing with everyday problems the way Fermi did lies in the rewards of making independent discoveries and inventions: It doesn’t matter whether the discovery is as important as determining the power of an atom or as small as measuring the distance between New York and Los Angeles. Looking up the answer, or letting someone else find it, deprives you of the pleasure and pride that accompany creativity, and deprives you of an experience that builds up self-confidence. Thus, approaching personal dilemmas as Fermi problems can become a habit that enriches your life.

Fermi’s team was impressed by Fermi’s announcement in the base camp because he could even work out the power of the atom bomb in his mind.

A．Right

B．Wrong

C．Not mentioned

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第2题

Scientists first ________ the idea of the atom bomb in the 1930s.A) imaginedB) conc

Scientists first ________ the idea of the atom bomb in the 1930s.

A) imagined

B) conceived

C) considered

D) acknowledged

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第3题

The History of the Atomic Bomb On August 2, 1939, just before the beginning of World War I

The History of the Atomic Bomb

On August 2, 1939, just before the beginning of World War II, Albert Einstein wrote to then President Franklin D. Roosevelt. Einstein and several other scientists told Roosevelt of efforts in Nazi Germany to purify uranium-235, which could be used to build an atomic bomb. It was shortly thereafter that the United States Government began the serious undertaking known then only as "The Manhattan Project". Simply put, the Manhattan Project was committed to expediting research that would produce a viable atomic bomb.

The most complicated issue to be addressed in making of an atomic bomb was the production of ample amounts of "enriched" uranium to sustain a chain reaction. At the time, uranium-235 was very hard to extract. In fact, the ratio of conversion from uranium ore to uranium metal is 500:1. Compounding this, the one part of uranium that is finally refined from the ore is over 99% uranium-238, which is practically useless for an atomic bomb. To make the task even more difficult, the useful U-235 and nearly uselessU-238 are isotopes(同位素), nearly identical in their chemical makeup. No ordinary chemical extraction method could separate them; only mechanical methods could work.

A massive enrichment laboratory/plant was constructed at Oak Ridge, Tennessee. Harold C. Urey and his colleagues at Columbia University devised an extraction system that worked on the principle of gaseous diffusion, and Ernest O. Lawrence (inventor of the Cyclotron) at the University of California in Berkeley implemented a process involving magnetic separation of the two isotopes.

Next, a gas centrifuge was used to further separate the lighter U-235 from the heavier, non-fissionable U-238. Once all of these procedures had been completed, all that needed to be done was to put to the test the entire concept behind atomic fission ("splitting the atom", in layman's terms).

Over the course of six years, from 1939 to 1945, more than $2 billion was spent during the history of the Manhattan Project. The formulas for refining uranium and putting together a working atomic bomb were created and seen to their logical ends by some of the greatest minds of our time. Chief among the people who unleashed the power of the atom was J. Robert Oppenheimer, who oversaw the project from conception to completion.

Finally, the day came when all at Los Alamos would find out if "The Gadget" (code-named as such during its development) was going to be the colossal dud of the century or perhaps an end to the war. It all came down to a fateful morning in midsummer, 1945.

Which of the following is the least possible reason for the launching of the Manhattan Project？

A．Franklin D. Roosevelt.

B．Nazi Germany.

C．Albert Einstein and other scientists.

D．The Second World War.

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第4题

The nuclear age in which the human race is living, and may soon be dying, began for the ge

neral public with the dropping of an atom bomb on Hiroshima on 6 August 1945. But for nuclear scientists and for certain American authorities, it had been known for some time that such a weapon was possible. Work towards making it had been begun by the United States, Canada and Britain very soon after the beginning of the Second World War. The existence of possibly explosive forces in the nuclei of atoms had been known ever since the structure of atoms was discovered by Rutherford.

An atom consists of a tiny core called the "nucleus" with attendant electrons circling round it. The hydrogen atom, which is the simplest and lightest, has only one electron. Heavier atoms have more and more as they go up the scale. The first discovery that had to do with what goes on in nuclei was radioactivity, which is caused by particles being shot out of the nucleus. It was known that a great deal of energy is locked up in the nucleus, but, until just before the outbreak of the Second World War, there was no way of releasing this energy in any large quantity. A revolutionary discovery was that, in certain circumstances, mass can be transformed into energy in accordance with Einstein's formula which states that the energy generated is equal to the mass lost multiplied by the square of the velocity of light.

The A-bomb, however, used a different process, depending upon radioactivity. In this process, called "fission", a heavier atom splits into two lighter atoms. In general, in radioactive substances this fission proceeds at a constant rate which is slow where substances occurring in nature are concerned. But there is one form. of uranium called "U235" which, when it is pure, sets up a chain reaction which spreads like fire, though with enormously greater rapidity. It is this substance which was used in making the atom bomb.

The political background of the atomic scientists' work was the determination to defeat the Nazis. It was held--I think rightly--that a Nazi victory would be an appalling disaster. It was also held, in Western countries, that German scientists must be well advanced towards making an A-bomb, and that if they succeeded before the West did they would probably win the war. When the war was over, it was discovered, to the complete astonishment of both American and British scientists, that the Germans were nowhere near success, and as everybody knows, the Germans were defeated before any nuclear weapons had been made. But I do not think that nuclear scientists of the West can be blamed for thinking the work urgent and necessary. Even Einstein favored it.

When, however, the German war was finished, the great majority of those scientists who had collaborated towards making the A-bomb considered that it should not be used against the Japanese, who were already on the verge of defeat and, in any case, did not constitute such a menace to the world as Hitler. Many of them made urgent representations to the American Government advocating that, instead of using the bomb as a weapon of war, they should after a public announcement, explode it in a desert, and that future control of nuclear energy should be placed in the hands of an international authority. Seven of the most eminent of nuclear scientists drew up what is known as "The Franck Report" which they presented to the Secretary of War in June 1945. This is a very admirable and far-seeing document, and if it had won the assent of the politicians, none of our subsequent terrors would have arisen.

We may infer that the writer's attitude towards the A-bomb is that ______.

A．it is a necessary evil

B．it is a terrible threat to the whole of mankind

C．it played a vital part in defeating the Japanese

D．it was a wonderful invention

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第5题

根据材料请回答 16～22 题 Fermi ProblemOn a Monday morning in July, the world' s first at

根据材料请回答 16～22 题

Fermi Problem

On a Monday morning in July, the world' s first atom bomb exploded in the New

Mexico desert.Forty seconds later, the shock waves reached the base camp where the I-talian-American physicist Enrico Fermi and his team stood.After a mental calculation, Fermi announced to his team that the bomb's energy had equated 10,000 tons of TNT.The bomb team was impressed, but not surprised.Fermi' s genius was known throughout the scientific world.In 1938 he had won a Nobel Prize.Four years later he produced the first nuclear chain reaction, leading' us into the nuclear age.Since Fermi's death in 1954,no physicist has been at once a master experimentalist (实验家) and a leading theoretician

Like all virtuosos (大师), Fermi had a distinctive style.He preferred the, most direct route to an answer.He was very good at dividing difficult problems into small, managea-ble bits talent we all can use in our daily lives,

To develop this talent in his students, Fermi would suggest a type of question now known as a Fermi problem.Upon first hearing one of these, you haven't the remotest no-tion of the answer, and you feel certain that too little information had been given to solve it.Yet when the problem is broken into sub-problems， each answerable without the help of experts or books, you can come close to the exact solution.

Suppose you want to determine Earth's circumference without looking it up.Every-one knows that New York and Los Angeles are about 3,000 miles apart and that the time difference between them is three hours.Three hours is one-eighth of a day, and a day is the time it takes the planet to complete one rotation (旋转), so its circumference must be eight times 3000 or 24000 miles.This answer differs from the true value, 24,902.45 mi-les, by less than four percent.

Ultimately (最终地) the value of dealing with everyday problems the way Fermi did lies in the rewards of making independent discoveries and inventions.It doesn't matter whether the discovery is as important as determining the power of an atom or as small as measuring the distance between New York and Los Angeles.Looking up the answer, or letting someone else find it, deprives you of the pleasure and pride that accompany creativ-ity, and deprives you of an experience that builds up self-confidence.Thus, approaching personal dilemmas as Fermi problems can become a habit that enriches your life.

第 16 题 Fermi's team was impressed by Fermi' s announcement in the base camp because he could even work out the power of the atom bomb in his mind.

A．Right

B．Wrong

C．Not mentioned

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第6题

Another example of a scientific model would be ______.A．a mapB．a paper airplaneC．an atomD．

Another example of a scientific model would be ______.

A．a map

B．a paper airplane

C．an atom

D．a light bulb

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第7题

If true, this would mean that the accepted view of the atom as the smallest possible fragment of matter was false.

A．If her hypothesis was right, it would mean that people had to change their view of the atom being the smallest unit of matter, which was a common view at the time

B．According to her hypothesis, it was true that the accepted view of the atom as the smallest possible fragment of matter was fals

E．

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第8题

How large is the magnetic field generated by the electron in the ground state of a hydrogen atom, at the position of the proton if it would circulate according to Bohr model on the shell n = 1？（)

A.3.11 T

B.12.54 T

C.6.27 T

D.7.98 T

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第9题

The caller warned that the bomb would explode when the plane______.A．took off from New Yor

The caller warned that the bomb would explode when the plane______.

A．took off from New York

B．arrived at Moscow

C．left for Iceland

D．reached Voronezh