I suggest reading Richard Rhodes books: The Making Of The Atomic Bomb and Dark Sun. They can explain it more clearly than can be done here.
The very first nuclear reactor was Chicago Pile 1. It was built for research and scientific use. The first nuclear reactor outside of a university was built (at Hanford, Washington) primarily to yield plutonium for the atomic bomb destined for Nagasaki, Japan. Nuclear reactors were built primarily for electrical generation beginning in about 1951.
the nuclear bomb came from nuclear fissons
In my opinion, the nuclear bomb.
Te nuclear bomb
The first commercial nuclear power plant in the US was built in 1957 in Shippingport, Pennsylvania. The first commercial nuclear power plant in the world was built in 1956 in Calder Hill, UK.
1945
Built bomb shelters
The people who built those nuclear technology and the people who was working then got blasted by a nuclear bomb.
in pakistan Ridiculous! The first nuclear bombs were built at Los Alamos, NM in 1945.
The US has built them from 50 pounds to 500 tons. It depends on purpose.
In the 60's we called them "bomb shelters."
Nuclear bomb can mean either fission or fusion bomb. Hydrogen bomb means fusion bomb. The fusion bomb can be built with any yield one wants, just by adding more stages with more fuel. The fission bomb has a theoretical maximum yield that cannot be exceeded.
A nuclear bomb is any bomb with any nuclear or atomic material inside it, while a plutonium bomb is a specific type of nuclear bomb. Plutonium could be the nuclear material inside the bomb, and if it is, it's a plutonium bomb.
the hydrogen bomb, is a nuclear bomb
No, it was invented in London in 1933 and built in Los Alamos, NM in 1945.
An atomic bomb is a nuclear weapon. A nuclear fusion bomb, (hydrogen, is usually much stronger than a nuclear fission bomb (uranium or plutonium). The weapons detonated in Japan during WWII measured about 15 kilotons equivalent of TNT. Today, most nuclear weapons are measured by megaton (1000X kiloton) equivalents up to a bomb built by the Russians with a possible yield of 100 megatons.
A bomb can be either conventional or nuclear.