Question

The sky appears dark to passengers flying at very high altitudes mainly because

• A. 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

The correct option is A

A scattering of light is not enough at such heights.

Explanation:

1. When light rays collide with an obstacle such as dust, gas molecules, or vapors, they deviate from their straight path and scatter. This phenomenon is known as the scattering of light.
2. The sky looks bright and blue because of the scattering of light by the gas molecules and particles present in the atmosphere.
3. The atmospheric substance is much less at higher altitudes, and the amount of light scattering is much lower.
4. Due to the low scattering of light at high altitudes, the sky looks dark.

Hence, the correct option is (a) A scattering of light is not enough at such heights.