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Question
Complete the following statement:
When the sun is setting, the light from it has to travel a ................ thickness of the earth's atmosphere and only ................ wavelength ................ light is able to reach us. Sunset is therefore ................
Solution
When the sun is setting, the light from it has to travel a greater thickness of the earth's atmosphere and only the longer wavelength red light is able to reach us. Sunset is therefore red in colour.
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