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. Explain why an infrared remote control may not switch on the television from behind an armchair but a radio wave remote control always will.

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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 radi... 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

Step 1

Which colour of visible light has the longest wavelength?

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Answer

The correct answer is C. red.

Red light has the longest wavelength in the visible spectrum, typically around 620 to 750 nanometers. In contrast, blue light has shorter wavelengths of around 450 to 495 nanometers.

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.

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Answer

Infrared remote controls emit infrared radiation that requires a direct line of sight to function. If the remote is behind an obstruction, like an armchair, the infrared signal cannot reach the television.

In contrast, radio wave remote controls utilize radio waves, which can penetrate through obstacles. This allows them to communicate with the television from a distance and even through barriers, ensuring consistent functionality regardless of obstructions.

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