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A fluorescent tube contains a gas - AQA - A-Level Physics - Question 15 - 2022 - Paper 1
Question 15
A fluorescent tube contains a gas. The coating of the tube. A becomes ionised by the gas and emits photons of ultraviolet light. B absorbs photons of ultraviolet ... show full transcript
Worked Solution & Example Answer:A fluorescent tube contains a gas - AQA - A-Level Physics - Question 15 - 2022 - Paper 1
Step 1
B absorbs photons of ultraviolet light from the gas and emits visible light.
Answer
The correct answer is B. In a fluorescent tube, the gas inside typically gets excited by an electric current, which produces ultraviolet (UV) light. The coating on the inside of the tube absorbs this UV light and in turn emits visible light. This is the principle behind fluorescent lighting, where the UV light generated by the gas ionisation is transformed into visible light by the tube's coating.