(A) radio beams used to determine location of objects
(B) the world’s first computer
(C) ** effort by the US to build the first atomic bomb
(D) a complicated code machine used by German military
EXPLANATIONS BELOW
Concept note-1: -The Manhattan Project produced the first atomic bomb. Several lines of research were pursued simultaneously. Both electromagnetic and fusion methods of separating the fissionable uranium-235 from uranium-238 were explored at Oak Ridge in Tennessee.
Concept note-2: -President Truman authorized the use of the atom bombs in an effort to bring about Japan’s surrender in the Second World War. In the days following the bombings Japan surrendered. The Manhattan Project was the US government program during World War II that developed and built these first atomic bombs.
Concept note-3: -Eventually 130, 000 people participated in the Manhattan Project. By July 1945, scientists had developed three atomic bombs.
Concept note-4: -Background Information: The U.S. Department of Energy (DOE) traces its origins to World War II and the Manhattan Project effort to build the first atomic bomb.