Question

What did Crookes suggest in 1879 about cathode rays?

Options

• They consisted of streams of low-speed positively charged particles.

• They were oil droplets carrying an integral multiple of an elementary charge.

• They were emitted only when metals were irradiated with ultraviolet light.

• They consisted of streams of fast-moving negatively charged particles.

Answer 1

In 1879, Crookes suggested that cathode rays were streams of fast-moving negatively charged particles. Thomson later confirmed this idea.