Question Detail
Question
What are cathode rays primarily composed of?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Page 8 explicitly states, "Cathode rays are stream of electrons leaving the negative electrode (cathode) in a discharge tube containing a gas at low pressure - electrons emitted by a heated filament in certain electron tubes."
Hint
Recall early experiments involving discharge tubes and the discovery of subatomic particles.