The atomic bomb dropped on Hiroshima

The Bomb Called "Little Boy"
Through self-sustaining nuclear fission (chain reaction), an atomic bomb emits a huge amount of energy instantaneously.
  The atomic bomb dropped on Hiroshima was a gun-barrel bomb. The uranium was divided into two pieces, both less than a critical mass and placed at either end of a cylinder. When one piece was fired into the other, critical mass was achieved.
  Though the bomb was long and thin in shape, it grew shorter over the course of the project. Hence, the final bomb was called "Little Boy."

●"Little Boy," the Atomic Bomb Dropped on Hiroshima

  1. A detonator was used to trigger the explosion.
  2. One mass of uranium was fired into the other.
  3. The neutrons created by that firing started a fission chain reaction, generating a tremendous amount of energy instantaneously.
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