Question

The cathode rays tube experiments carried out by J.J. Thomson demonstrated that :

• A. ratio of charge to-mass for the particles of the cathode rays varies as different gases are placed in the tube.
• B. the mass of an atom is essentially all contained in its very small nucleus.
• C. cathode rays are streams of negatively charged ions.
• D. the charge-to-mass ratio for an electron is same for all gases.

Answer 1

Answer: (D)

the charge-to-mass ratio for an electron is same for all gases.

In 1897, Thomson showed that cathode rays were composed of previously unknown negative charge particles smaller than atoms and a very large value for their charge to mass ratio. He measured m/e ratio of cathode rays by their deflection in magnetic field.