(A) A discharge lamp uses a discharge tube which is filled with a gas at very low pressure.
(B) White light is always emitted independent of gas taken in the lamp.

Only A is true

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Only B is true

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Both A and B are true

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Both A and B are false

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Solution

The correct option is B Only A is true
Light emitted will depend on the gas present in the lamp. For example : sodium lamp give yellow colour. It happens because of the transmission of electron from one state to other.

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