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In a discharge tube ionization of enclosed gas is produced due to collisions between
(a)Negative electrons and neutral atoms / molecules
(b)Photons and neutral atoms /molecules
(c)Neutral gas atoms/molecules
(d)Positive ions and neutral atoms/molecules
(a)
When electron emitted from cathode collide with gas molecules or atoms, they knock out outer electrons and produce positively charged ions. They become part of positive rays.
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