Article Detail Who invented Atomic Bomb ? Answer: J. Robert Oppenheimer of U.S.A. in 1945 Similar Questions : 1. Who invented CT scan ? Answer: Hounsfield by Britain in 1973. 2. Who invented Transformer ? Answer: Ottó Bláthy 3. Who invented Relativity Theory ? Answer: Einstein of Germany in 1905. 4. Who invented Calculus ? Answer: Newton of Britain in 1670. 5. Who invented Periodic table ? Answer: Dmitri Mendeleev invented Periodic Table 6. Who invented watch ? Answer: Peter Henlein invented the first portable time piece in 1504 7. Who invented Biochemistry ? Answer: Jan Baptista Van Helmont of Belgium in 1648. Read more from - Important Inventions