A) cathode rays are streams of negatively charged ions
B) all the mass of an atom is essentially in the nucleus
C) the e/m of electrons is much greater than the e/m of protons
D) the e/m ratio of the cathode ray particles changes when a different gas is placed in the discharged tube
Correct Answer: C
Solution :
According to J.J. Thomsons cathode ray tube experiment, the e/m of electrons is much greater than the e/m of protons.
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