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 ................

Answer 1

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.