Final answer:
Cathode rays constitute a stream of electrons, whereas gamma rays and X-rays are electromagnetic radiations that do not consist of electrons.
Step-by-step explanation:
The radiation that constitutes a stream of electrons is known as cathode rays.
Conversely, gamma rays and X-rays are forms of electromagnetic radiation and do not consist of electrons.
Gamma rays originate from nuclear decay, possess a great amount of energy and are represented by the symbol γ.
X-rays are produced when electrons are ejected by thermal agitation from a hot filament in a vacuum tube, accelerated through high voltage, and strike the anode.
Some of the kinetic energy of these electrons is converted into X-ray photons.
The process of accelerating electrons and producing electromagnetic waves in a vacuum tube is associated with a cathode ray tube (CRT).