J.J. Thomson's cathode ray tube experiment demonstrated that:
A
Cathode rays are streams of negatively charged ions
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B
All the mass of an atom is essentially in the nucleus
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C
The em of electrons is much greater than the em of protons
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D
The em ratio of the cathode ray particles changes when a different gas is placed in the discharged tube
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Solution
The correct options are A Cathode rays are streams of negatively charged ions C The em of electrons is much greater than the em of protons Thomson's experiment revealed that cathode rays are composed of negatively charged particles called electrons. He also determined that the charge to mass ratio of electrons which was much greater (about 2000 times) than that of proton.