Question

Why clouds appear white ?

Answer 1

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•Q. Why are clouds white?

•Ans. When clouds are white (and many are not), “it’s because light from the sun is white, a combination of all the colors of the rainbow,” said Michael Kaufman, professor of physics and astronomy at San Jose State University in California. As light moves through the clouds, it is dispersed by water droplets. These are comparable to or bigger than the wavelengths of light, Dr. Kaufman said, and there are lot of droplets in the average cloud.

•The result is that all the wavelengths are scattered more or less uniformly; to our eyes, no color predominates...

•“Looking at a cloud from any other angle, you see a mixture of all the scattered colors, so it looks white,” This effect is called Mie scattering, he added, “and is what you get when the wavelength of light and the particles it hits are comparable in size. It also works when particles are bigger than wavelengths of light.”....

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Answer 2

Answer:

*If light is scattered by large particles like dust and water droplets present in the atmosphere which have size a greater than the wavelength lambda of light, a>>lambda, the intensity of scattering is equal for all the wavelengths.

*It is happening in clouds which contains large amount of dust and water droplets. Thus, in clouds all the colors get equally scattered irrespective of wavelength .This is the reason for the whitish appearance of cloud.