Question

5. Sometimes sky appears to be white. This is because
A. the size of molecules that comes in the path of sunlight is larger than the wavelength of light
B. all colours of light will be scattered in equal amount
C. the size of molecules that comes in the path of sunlight is smaller than the wavelength of
light
(a) only A
(b) both A and B
(c) both B and C
(d) A, B and C

Answer 1

the size of molecules that come in the path of sunlight is larger than the wavelength of light

Answer 2

Sometimes sky appears to be white. This is because (b) both A and B.

Explanation:

• Earth's atmosphere consists of different types of particle with different sizes.
• These different sized particles scatter different wavelengths of light.
• On a hot sunny day, the temperature of the atmosphere is high and this causes water molecules to exist in the atmosphere due to evaporation.
• These water molecules scatter almost all of the wavelengths of light and all those wavelengths are reflected into our eyes which is why we see the sky as white.
• So, all colours are scattered in equal amounts because of lot of water molecules.
• Size of molecules are larger than the wavelength of light in the path of sunlight.