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| Q. |
The blue colour of sky is due to – |
| A. | reflection of sunlight |
| B. | refraction of sunlight |
| C. | scattering of shorter wave-lengths of sunlight in the atmosphere |
| D. | scattering of longer wave-lengths of sunlight in the atmosphere |
| Answer» C. scattering of shorter wave-lengths of sunlight in the atmosphere | |
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Explanation: The blue colour of the sky is caused by the scattering of sunlight off the molecules of the atmosphere. This scattering, called Rayleigh scattering is more effective at short wavelengths (the blue end of the visible spectrum). Therefore the light scattered down to the earth at a large angle with respect to the direction of the sun's light is predominantly in the blue end of the spectrum. |
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