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In a discharge tube, the colored illumination observed is due to interactions between the gas atoms and the charged particles originating from the cathode.

1. True
2. False
3. Indeterminate
4. Not applicable

Correct answer: True

Solution

The colored glow in a discharge tube is caused by the excitation of gas atoms due to collisions with charged particles emitted from the cathode. When these excited atoms return to their ground state, they emit light, producing the glow.

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