Question

The nature of the cathode ray depends on the electrode used in the discharge tube.

• A. True
• B. False

Answer 1

The correct option is B False

• In 1897, J. J. Thomson determined the e/m value (charge/mass) of the electron by studying the deflections of cathode rays in electric and magnetic fields. The value of e / m has been found to be $-1.7588\times {10}^8\mathrm{coulomb}/\mathrm{g}.$
• By performing a series of experiments, Thomson proved that whatever the gas taken in the discharge tube and whatever the material of the electrodes, the value of e / m is always the same. Electrons are thus common universal constituents of all atoms.
• Hence, the given statement is false.