Question

Which of the following statement(s) is/are not correct regarding cathode rays?

• A. The rays carry negative charge
• B. The charge/mass of these rays is considerably smaller than for positive rays
• C. The rays produce mechanical effect
• D. The charge/mass ratio is independent of the nature of the gas taken in the discharge tube

Answer 1

Answer: (B)

The charge/mass of these rays is considerably smaller than for positive rays

Cathode rays are generated from cathode that's why they have electrons.
Since mass of electrons is less than that of protons, thus charge/mass ratio of cathode rays are much higher than that of proton rays.
Since these rays have particle nature also, thus it can rotate wheel if placed in their path, therefore mechanical effect.
Charge/mass ratio of these gas in independent of gas taken in discharge tube unlike anode rays, because cathode rays have electrons, thus charge/mass ratio is constant.