Question

Goldstein discovered existence of positively charged rays in the discharge tube and named them:
(A) Canal rays
(B) Anode rays
(C) Cathode rays
(D) Both A and B

Answer 1

Hint :To answer this question, we need to know about the experiment performed by Goldstein in 1886. He discovered protons and the rays going opposite to the negatively charged cathode rays and named them canal rays.

Complete Step By Step Answer:
Eugene Goldstein (1850–1930), a physicist, found proof of this positively charged particle in 1886. He discovered rays going in the opposite direction from the cathode rays using a cathode ray tube with holes in the cathode. These canal rays were given the name canal rays by him, and he demonstrated that they were made up of positively charged particles. The proton is a subatomic particle that is positively charged.
A proton remains after an electron is separated from a hydrogen atom. In a cathode ray tube, Goldstein detected rays travelling in the opposite direction of the cathode rays. The canal rays were named after he showed that these rays were positive particles. These canal rays were given the name as anode rays.
So, the correct answer is (d).

Note :
In the 1870s, Goldstein performed his own discharge tube experiments and called the light emissions or cathode rays. He discovered several important cathode ray properties, which contributed to the electron's discovery as the first subatomic particle.