Multiple choice general knowledge science & technology

What is emitted by the hot metal filament in a cathode ray tube?

  1. protons

  2. neutrons

  3. electrons

  4. x-rays
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a cathode ray tube, the hot metal filament (cathode) emits electrons through a process called thermionic emission. These electrons are then accelerated toward the anode, forming the cathode ray. Protons and neutrons remain in the nucleus, and X-rays are produced when electrons strike the target, not emitted by the filament.

Keep practicing — related questions