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

  • cathode rays are streams of negatively charged ions

  • all the mass of an atom is essentially in the nucleus

  • the e/m of electrons is much greater than the e/m of protons.

  • the e/m ratio of the cathode ray particles changes when a different gas is placed in the discharged tube

Answer

C.

the e/m of electrons is much greater than the e/m of protons.

According to J.J. Thomson's cathode ray tube experiment, the e/m of electrons is much greater than the e/m of protons.

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