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1. (a) Which colour of visible light has the longest wavelength? A - Edexcel - GCSE Physics Combined Science - Question 1 - 2019 - Paper 1
Question 1
1. (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 radiatio... show full transcript
Worked Solution & Example Answer:1. (a) Which colour of visible light has the longest wavelength? A - Edexcel - GCSE Physics Combined Science - Question 1 - 2019 - Paper 1
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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 is a form of light that generally requires a direct line of sight to function effectively. This means that if an infrared remote is used from behind an obstruction, like an armchair, the signal might be absorbed or blocked, preventing the TV from receiving the command.
In contrast, radio wave remote controls emit radio waves that can penetrate obstacles, allowing them to operate even when there is a physical barrier in place. This characteristic makes radio wave remotes more versatile for use from various angles and positions.