Which best describes the effect of J. J. Thomson's discovery? The accepted model of the atom was changed. The accepted model of the atom was supported. Cathode ray tubes were no longer used in experiments due to poor results. Cathode ray tubes became the only instrument of use in the study of atoms.

Cathode ray tubes became the only instrument of use in the study of atoms. By comparing the deflection of a beam of cathode rays by electric and magnetic fields he obtained more robust measurements of the mass to charge ratio that confirmed his previous estimates. T his became the classic means of measuring the charge and mass of the electron.