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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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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
An infrared remote control relies on infrared radiation, which requires a direct line of sight to function effectively. If the remote control is used from behind an armchair, the infrared signal may be blocked by the furniture, preventing the television from receiving the signal.
In contrast, a radio wave remote control uses radio waves which can penetrate obstacles such as walls and furniture. Therefore, it can operate the television even when the remote control is behind an armchair, as the radio waves can travel through solid objects.