What is the difference between a atomic bomb and nuclear bomb, and which plane dropped the nuclear bomb in Nagasaki and in Hiroshima??
Both atomic bombs and hydrogen bombs are types of nuclear weapons. This means that instead of getting their destructive energy from combustion like a conventional bomb, they get their energy from nuclear reactions. An atomic bomb is a fission type bomb, meaning the nucleus of a large atom is actually split into smaller elements, thus releasing energy. Uranium and plutonium are good examples of radioactive atomic nuclei that undergo fission. A hydrogen bomb uses fusion instead as its main power source. Hydrogen atoms are fused together to make helium atoms. A hydrogen bomb actually uses a fission type bomb as a "starter" to provide the initial energy for the fusion reaction.
The bombs used against Japan in WW2 were atomic bombs (hydrogen bombs were't invented until the 1950's). They were both carried over Japan by B-29 planes and dropped over their targets. The plane that carried the Hiroshima bomb was called the Enola Gay. The Nagasaki bomb was carried by the Bockscar.