Directions: Read and annotate each paragraph for the main idea, then answer the critical thinking questions below



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NAME______________________________________________________ The Manhattan Project Reading

Directions: Read and annotate each paragraph for the main idea, then answer the critical thinking questions below.

History of the Atomic Bomb & The Manhattan Project By Mary Bellis, About.com Guide
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.
Making Enriched Uranium

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 useless U-238 are isotopes, 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 Urey and his colleagues at Columbia University devised an extraction system that worked on the principle of gaseous diffusion, and Ernest 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).
Robert Oppenheimer - Manhattan Project

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 Robert Oppenheimer, who oversaw the project from conception to completion.


Testing The Gadget aka Atomic Bomb

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.


At 5:29:45 (Mountain War Time) on July 16, 1945, in a white blaze that stretched from the basin of the Jemez Mountains in northern New Mexico to the still-dark skies, "The Gadget" ushered in the Atomic Age. The light of the explosion then turned orange as the atomic fireball began shooting upwards at 360 feet per second, reddening and pulsing as it cooled. The characteristic mushroom cloud of radioactive vapor materialized at 30,000 feet. Beneath the cloud, all that remained of the soil at the blast site were fragments of jade green radioactive glass created by the heat of the reaction.

The brilliant light from the detonation pierced the early morning skies with such intensity that residents from a faraway neighboring community would swear that the sun came up twice that day. Even more astonishing is that a blind girl saw the flash 120 miles away.


Upon witnessing the explosion, its creators had mixed reactions. Isidor Rabi felt that the equilibrium in nature had been upset as if humankind had become a threat to the world it inhabited. Robert Oppenheimer, though ecstatic about the success of the project, quoted a remembered fragment from the Bhagavad Gita. "I am become Death," he said, "the destroyer of worlds." Ken Bainbridge, the test director, told Oppenheimer, "Now we're all sons of bitches."
After viewing the results several participants signed petitions against loosing the monster they had created, but their protests fell on deaf ears. The Jornada del Muerto of New Mexico would not be the last site on planet Earth to experience an atomic explosion.

Main Ideas and Author’s Approach (20-23): Infer main idea or purpose of straightforward paragraphs in uncomplicated literary narratives.

How did each scientist feel after the first successful test?



Supporting Details (20-23): Locate important details in uncomplicated passages. Make simple inferences about how details are used in passages.

What was the biggest problem in obtaining enough uranium for the bombs?

Where was the test site for The Manhattan Project?

Sequential, Comparative, and Cause-Effect Relationships (20-23): Identify clear relationships between people, ideas, and so on in uncomplicated passages. Identify clear cause-effect relationships in uncomplicated passages.

What specific event caused FDR to begin funding The Manhattan Project?

After the first successful test of The Gadget, what did the scientists do? Why?

Meaning of Words (20-23): Use context to determine the appropriate meaning of some figurative and nonfigurative words, phrases, and statements in uncomplicated passages.

Define extraction and atomic fission.




Generalizations and Conclusions (20-23): Draw generalizations and conclusions about people, ideas, and so on in uncomplicated passages
If the Germans possessed a nuclear bomb before the United States could develop one, how could the outcome of the war have changed?


Does this document support or not support the use of the atomic bomb to end war with Japan? Why or why not?


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