Medical professionals later came to believe that more than 225,000 people died when everyone affected after long periods of time are counted. People from the Manhattan Project believe that around 105,000 people were killed and 94,000 were hurt when the bombs were used. Two of these bombs were used by the United States to attack the cities of Hiroshima and Nagasaki in Japan. The program was called the " Manhattan Project".īy August 1945, the Manhattan Project built three nuclear fission weapons. It built upon the work done in the United Kingdom. Later that year, the United States started a very large program to build nuclear weapons. The United Kingdom started working in 1939, but it took too much money, so they gave up in 1942. Germany did not finish building them, partly because many of the best people studying physics fled Germany after Nazi rule started. When World War II started, Germany, the United Kingdom and the United States wanted to build nuclear weapons.
#Largest fission bomb how to
In 1939, people studying physics began to understand the theory of nuclear fission weapons, but no country knew how to build one. Fusion weapons use a special isotope of hydrogen. Fission weapons use a special isotope of uranium or plutonium.
The way they make energy for the nuclear explosion is different. There are two ways to make nuclear weapons: fission weapons (also called atomic bombs or A-Bombs) and fusion weapons (also called hydrogen bombs, H-Bombs or thermonuclear weapons). South Africa used to have nuclear weapons, but they decided to destroy them. The other countries that have nuclear weapons are: China, France, United Kingdom, India, Israel, North Korea, and Pakistan. Today, the United States and Russia have the most nuclear weapons. These were the only times when nuclear weapons were used in war. Two nuclear weapons were used to attack cities in Japan. The first nuclear weapons were built by the United States during World War II. Nuclear weapons are the most damaging weapons to have been created. They also make nuclear fallout that may also make people very sick. Nuclear explosions can destroy a city and kill most of its people. When triggered, these devices release a huge amount of energy in the form of a nuclear explosion. Nuclear explosion test in Nevada in 1953.Ī nuclear weapon, also known as a nuclear bomb or a nuke, is a weapon that suddenly releases the energy in the nucleus of certain types of atoms.
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