Multiple choice

Which of the following is true about cathode rays?

(a) Cathode rays are invisible and travel in a straight line. (b) Cathode rays visible and travel in a straight line. (c) Cathode rays cool the material they fall on. (d) Cathode rays heat the material they fall on.

  1. a and c

  2. b and c

  3. b and d

  4. d and a

  5. d and c
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cathode rays are invisible and travel in a straight line. It heats the material on which it falls.

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