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Choose the true statement(s) from the following, about cathode rays in a gas discharge tube
A. High pressures are necessary in order to push the electrons.
B. The polarity of the electrodes cathode and anode does not matter, it can easily be reversed.
C. Low pressures are necessary in order to enhance scattering of electrons with gas molecules.
D. A high potential difference causes a gas to become conductor if the gas pressure in the tube is very low.
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