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| Q. |
Sun appears red in colour at sun-rise and sunset due to – |
| A. | the fact that sun emits only red colour at that time |
| B. | red light having longer wave length scatters away |
| C. | that sun Comes out of the mountains |
| D. | that all other colours scatter away except red |
| Answer» D. that all other colours scatter away except red | |
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Explanation: According to Rayleigh's law, the intensity of scattered light varies inversely as the fourth power of its wavelength. Sunlight consists of seven colours. Of these, red has the maximum wavelength. During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. |
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