Question

Cathode rays are:

• A. electromagnetic waves
• B. stream of $\alpha$-particles
• C. stream of electrons
• D. radiations

Answer 1

Answer: (C)

stream of electrons

Cathode rays are stream of electrons that are negatively charged particles. Cathode rays travel in straight lines from the cathode. The ratio of e/m for a cathode ray is fixed at $1.758820\times {10}^{11}C/kg$. It is equal to the ratio of e/m for an electron.
Note: In e/m, e refers to charge and m refers to mass.