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Solution


Q.

The sky appears dark to passengers flying at very high altitudes mainly because:
1 Scattering of light is not enough at such heights.  
2 There is no atmosphere at great heights.  
3 The size of molecules is smaller than the wavelength of visible light.  
4 The light gets scattered towards the earth.  

Ans.

(1)

The scattering of light takes place due to the presence of particles in the atmosphere. This is because the atmospheric medium is very rare at higher altitudes, the scattering of light that takes place at these places is very low due to which the sky appears dark to the passengers flying at very high altitudes.