Jet engine was created to make a faster way of travel. It was not very impactful during WW2. The first jet engine wasn't used tell 1941. Germans were the first to use the jet engine with the Britich a few weeks later.
Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The idea of the radar started in 1880's but, was not created tell the 1930's.
Guided weapons is a weapon that is controlled were it goes. The development of controllable bombs began in the late 1930s under Max Kramer. The Guided missiles were used to take down ships, plains, and other things. The Germans used the guided weapon to sink or damage several Italian, British, and American warships in the Mediterranean, but its most high-profile success came on September 9, 1943 when several of the radio-controlled bombs sank the Italian battleship Roma and severely damaged the Italia as they were surrendering to the Allies.
Helicopters were used for troop transport, casualty evacuation, airborne command posts, search and/or rescue operations, and attacking ground targets. Helicopters would become very important for militaries around the world, with the US becoming the most extensive employer of these aircraft for military and civilian applications
Atomic Bomb is the most powerful weapons that use nuclear reactions as their source of explosive energy. A discovery by nuclear physicists in a laboratory in Germany in 1938 made the first atomic bomb possible. On August 6, 1945, the United States dropped its first atomic bomb from a B-29 bomber plane called the Enola Gay over the city of Hiroshima, Japan. When the Japanese did not immediately surrender, the United States dropped a second atomic bomb three days later on the city of Nagasaki.