Multiple choice

Cathode rays (electrons) have

  1. mass only

  2. charge only

  3. no mass and charge

  4. both mass and charge
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cathode rays (also called an electron beam or e-beam) are streams of electrons observed in vacuum tubes. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, the glass opposite of the negative electrode is observed to glow, due to electrons emitted from and travelling perpendicular to the cathode (the electrode connected to the negative terminal of the voltage supply). They were first observed in 1869 by German physicist Johann Hittorf, and were named in 1876 by Eugen Goldstein kathodenstrahlen, or cathode rays. Cathode rays (electrons) have both mass and charge.

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