Question

The sky appears dark to passengers flying at very high altitudes mainly
because :
(a) Scattering of light is not enough at such heights.
(b) There is no atmosphere at great heights.
(c) The size of molecules is smaller than the wavelength of visible light.
(d) The light gets scattered towards the earth.​

Answer 1

Answer:

(a) Scattering of light is not enough at such heights is the correct answer.

Explanation:

The throwing of light in various random directions is called scattering of light. As there are various types of suspended particles in air light gets scattered. The size of particles also plays a role in which colour of light to spread whether it be white sunlight or component colours of sunlight.

But, at such high altitudes sky appears dark to passengers because as we go high atmosphere becomes thinner or rarer and the suspended particles are also less which doesn't scatter the light much thus, sky appears dark to passengers.

Answer 2

Scattering of light is not enough at such heights and sky appears dark.

Option (A) is correct.

Explanation:

• The light goes in various random directions from a light source and is known as scattering.
• The scattering of light depends on the size of the particles.
• Light comes into contact with several particles in the atmosphere and gets scattered.
• At high altitudes, the atmosphere is not dense and the number of particles is less, therefore, the light does not scatter much.
• That's why the sky appears dark to the passengers.