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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 radiation and other remote controls use radio waves - 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 radiation an... show full transcript
Worked Solution & Example Answer: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 radiation and other remote controls use radio waves - 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 rely on infrared light, which can be blocked by solid objects, including an armchair. If the line of sight between the remote and the television is obstructed, the signal does not reach the receiver, preventing the television from responding. In contrast, radio wave remote controls use longer wavelengths that can penetrate obstacles, allowing them to communicate with the television even from behind an armchair.