Question

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

• A. the 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 constant irrespective of the atom.

Answer 1

Answer: (C), (D)

The correct options are
C cathode rays are streams of negatively charged ions.
D the charge-to-mass ratio for an electron is constant irrespective of the atom.

J.J. Thomson experiment had the following observations in a series of experiments.

1. The rays were deflected by the electric charge, proving beyond doubt that the rays were made up of charged particles carrying a negative charge.
   
2. The charge of the mass ratio of these negatively charged particles is same irrespective of the gas taken in a tube.
   

Hence, answer is C and D.