J.J.Thomson reasoned that cathode rays were really charged particles because
A)a magnet deflected cathode rays.
B)cathode rays formed only when the air was pumped out of a discharge tube.
C)the properties of the cathode rays depended on the cathode material.
D)the cathode rays were attracted to the anode.

Question

Quizplus · Accepted Answer

The fact that a magnet could deflect cathode rays indicated that they were charged particles, as a magnetic field only affects charged particles. The other options were observations made about cathode rays, but they did not directly indicate that the rays were composed of charged particles.

JJThomson Reasoned That Cathode Rays Were Really Charged Particles Because