A) the e/m of electrons is greater than the e/m of protons
B) the e/m ratio of the cathode-ray particles changes when a different gas is placed in the discharge tube
C) cathode rays are streams of negatively charged ions
D) all the mass of an atom is essentially in the nucleus
Correct Answer: A
Solution :
\[JJ\]Thomson's cathode-ray tube experiment demonstrated the relation for e/m of charged particles. The relation is \[\frac{e}{m}=\frac{{{E}^{2}}}{2{{B}^{2}}V}\] Thus, knowing £, B and V, the value of e/m for electrons and for protons can be calculated. It is found the e/m of electrons is much greater than the e/m of protons.
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