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2. (a) Which colour of visible light has the longest wavelength? A blue B green C red D yellow (b) Some television remote controls use infrared radiation and other remote controls use radio waves - Edexcel - GCSE Physics - Question 2 - 2019 - Paper 1
Question 2
2. (a) Which colour of visible light has the longest wavelength? A blue B green C red D yellow (b) Some television remote controls use infrared radiation and o... show full transcript
Worked Solution & Example Answer:2. (a) Which colour of visible light has the longest wavelength? A blue B green C red D yellow (b) Some television remote controls use infrared radiation and other remote controls use radio waves - Edexcel - GCSE Physics - Question 2 - 2019 - Paper 1
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Step 2
Explain why an infrared remote control may not switch on the television from behind an armchair but a radio wave remote control always will.
Answer
Infrared remote controls operate using infrared radiation, which requires a direct line of sight to the infrared receiver on the television. Obstacles, like the back of an armchair, can block infrared signals, preventing the remote from functioning. In contrast, radio waves have a longer wavelength and can penetrate obstacles more effectively, allowing radio wave remote controls to function even when not in direct line of sight.