Chemistry · Nature of electromagnetic radiation, photoelectric effect, spectrum of the hydrogen atom
Assertion A tube light emits white light. Reason Emission of light in a tube tak
Assertion A tube light emits white light. Reason Emission of light in a tube takes place at a very high temperature.
- A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- C. Assertion is correct but Reason is incorrect
- D. Both Assertion and Reason are incorrect
Step-by-step solution
Tube lights produce light via fluorescence: an electric discharge excites mercury vapor to emit UV light, which then excites a phosphor coating to emit visible light, often white. This process does not require high temperature; the tube operates at a low pressure and relatively low temperature. Therefore, the assertion is correct but the reason is incorrect.
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