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Assertion A tube light emits white light. Reason Emission of light in a tube takes place at a very high temperature.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Correct answer: Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Solution

A tube light does emit white light, so the assertion is correct. The reason is also broadly true that light emission involves a high temperature, but that is not why a tube light appears white; the white light is mainly due to ultraviolet radiation from the discharge exciting the phosphor coating.

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