The Atomic Bomb

Hiroshima: Day of Fire

Impact of the BombingGround temperatures

Hurricane force winds

Energy released

Buildings destroyed

Killed immediately

Dead by the end of 1945

Total deaths related to A-bomb

7,000°F

980 miles per hour

20,000 tons of TNT

62,000 buildings

70,000 people

140,000 people

200,000 people

The overwhelming destructive power of the Hiroshima bomb, and of the bomb dropped on Nagasaki three days later, changed the nature of war forever. Nuclear destruction also led to questions about the ethics of scientists and politicians who chose to develop and use the bomb.

The Atomic BombOn the eve of World War II, scientists in Germany succeeded in splitting thenucleus of a uranium atom, releasing a huge amount of energy. Albert Einsteinwrote to President Franklin Roosevelt and warned him that Nazi Germany mightbe working to develop atomic weapons. Roosevelt responded by giving hisapproval for an American program, later code-named the Manhattan Project, todevelop an atomic bomb. Roosevelt’s decision set off a race to ensure that theUnited States would be the first to develop the bomb.

▼ On the morning of August 6,1945, the B-29 bomber Enola Gay,flown by Colonel Paul W. Tibbets,Jr., took off from Tinian Island inthe Mariana Islands.

1. Making Inferences What advantagesdid the United States have overGermany in the race to develop theatomic bomb?

See Skillbuilder Handbook, page R10.

2. Comparing and Contrasting If youwere to design a memorial to thevictims of the Hiroshima andNagasaki bombings, what symbolwould you use? Make a sketch ofyour memorial.

▼ Nagasaki citizens trudge through the still smoldering ruinsof their city in this photograph by Yosuke Yamahata.

At precisely 8:16 A.M.,the atomic bombexploded aboveHiroshima, a city on the Japanese island of Honshu.

Patterns of InteractionArming for War: Modern and Medieval Weapons

Just as in World War I, the conflicts of World War II spurred thedevelopment of ever more powerful weapons. Mightier tanks, moreelusive submarines, faster fighter planes—all emerged from this period.From ancient times to the present day, the pattern remains the same:Every new weapon causes other countries to develop weapons ofsimilar or greater force. This pattern results in a deadly race for anultimate weapon: for example, the atomic bomb.

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The Atomic Bomb - mrcaseyhistory · develop an atomic bomb. Roosevelt’s decision set off a race...

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Atomic Bomb Development -Huge System …...Atomic bombs were used in Hiroshima and Nagasaki. These attacks were triggered to finish WWII. And, many countries started to develop Atomic