1945
Nope.
1933, but it took until 1945 to build them.
He invented the first nuclear weapon, the atomic bomb.
1949
The meaning of the word nuclear weapon, is a weapon that has a nuclear warhead on it.
India detonated it's first nuclear weapon on 1974at (POKRAN)a desert area in RAJASTHAN.
nuclear energy was first invented for a weapon of mass destruction (WOMD) but it was later developed as a main ingredient in the narcotic known as Molly (MDMA)
This nuclear weapon is called an atomic bomb or a nuclear bomb
Nuclear weapon detonations
If by "bomb" you mean a conventional explosive weapon, then the nuclear weapon is more powerful.
Nuclear winters imply that a nuclear weapon was used. In 1817, none was even invented. The US used the first against Japan at the end of WWII in 1945.
A hydrogen bomb is, by far, the most destructive weapon that mankind has ever invented. It is the most powerful type of nuclear bomb.