J.J.Thomson's cathode ray tube experiment demonstrated that ......

Options

A. the `(e)/(m)` ratio of the cathode ray particles changes when a different gas is placed in the discharge tube.
B. cathode rays are streams of negatively charged ions.
C. all the mass of an atom is essentially in the nucleus.
D. the `(e)/(m)` of electrons is much greater than the `(e)/(m)` of protons.

Answer

B

Explanation

cathode rays are streams of negatively charged ions.
cathode rays are streams of negatively charged ions.