The operating principles of the cathode-ray tube were discovered by _____.

A) George Ohm
B) Wilhelm Roentgen
C) Gustav Kirchhoff
D) J.J. Thomson

Cathode-ray Tube

A vacuum tube containing one or more electron guns and a fluorescent screen, used to display images or visualize electronic signals.

George Ohm

A German physicist known for formulating Ohm's Law, which relates the voltage across a conductor to the current flowing through it, proportional to its resistance.

Wilhelm Roentgen

A German physicist known for discovering X-rays, a significant breakthrough in the field of radiography and medical imaging.