A scientist who studies radioactivity is called a nuclear physicist or a radiologist.
A scientist would probably be a physicist or a chemist, but engineers can also study energy, and designing heat engines would be an engineers job. A specialist in this field would be a thermodynamicist.
Henri Becquerel was a French scientist who was credited for the discovery of radioactivity. He was credited in 1896.
Newton is the first and the most famous is Enstein
One of the known scientists of radiation is scientist Wilhelm Ršntgen. Along with Wilhelm Ršntgen , the scientist French scientist, Henri Becquerel studied radiation. He is best known for his studies on X-rays.
A physicist studies motion. This field of study includes understanding the properties of objects in motion, analyzing the causes of motion, and predicting the behavior of objects based on their motion.
The name of a scientist that studies sports is called a sports scientist.
An arachnologist
A virologist is a scientist who studies viruses.
A scientist who studies animals is called a zoologist.
A scientist who studies animal life is a zoologist. There is no particular name for a scientist that specialises in platypuses.
The name for this type of scientist is a teuthologist
This answer is a entomologistA scientist who only studies fish is called an ichthyologist.
Astronomer
environmentalist
ecologist
Parasitologist
Entomologist