It could be helpfull, but is not essential.
His field of study was in Physics.
Physiology.
physics
The answer is Atomic Physics. Atomic physics is the study of atomic interractions.
physics
Mathematics and Physics
Brian Cox is a physicist. He studies astronomy and physics. His known field is Particle physics which is the study of particles referred to as matter and radiation.
Nuclear Physics
it is important because the technology, that they operate is the product of physics.
physics. Please see the link.
He did math but he failed so he changed his profession to physics
Isaac newtons first field of study was the discovery of gravity