Physics
The fact that the planets move around the Sun, not in circles but in ellipses, was first demonstrated by

Copernicus
Galileo
Martin Luther
Johannes Kepler

ANSWER DOWNLOAD EXAMIANS APP

Physics
Radiocarbon is produced in the atmosphere as a result of

Lightning discharge in atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.
Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.

ANSWER DOWNLOAD EXAMIANS APP