a
heating a metal filament.
b
ionization of the air.
c
applying a magnetic field to the y-plates.
c
applying an electric field to the x-plates.
Explanation
Correct Option
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Discussions (2)

agadido
3 years ago
Cathode rays come from the cathode because the cathode is charged negatively. So those rays strike and ionize the gas sample inside the container. The electrons that were ejected from gas ionization travel to the anode. These rays are electrons that are actually produced from the gas ionization inside the tube.
U can research it. i go with B

