Why does light at sunset appear red?

Answer 1

Explanation is given below

The sun light has almost all wavelengths of Electromagnetic spectrum from shortest wavelength X-rays to longest wavelength radio waves. But we can see only visible spectrum ranging from #4000\ \text{to} \ 8000 A^\circ#.
According to Rayleigh's elastic scattering, the degree scattering is inversely proportional to #4#th power of wavelength. In this way, the longest visible wavelength i.e. red light scatters less.

During the sunset or sunrise, the sun is at horizon hence the visible light coming sun has to travel the longest distance through the atmosphere undergoing repeated collisions with gas atoms or molecules. Thus, all other colors (except red color) are scattered to greater extent than red light thus red light is dominant during sunset or sunrise. This makes sun appear red.

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Answer 2

Light appears red at sunset due to a phenomenon called Rayleigh scattering. As the sun sets, its light travels through a thicker layer of the Earth's atmosphere. This causes shorter wavelengths of light, such as blue and green, to scatter away more strongly, leaving longer wavelengths, such as red and orange, to dominate the sky. The result is the characteristic red hue seen during sunsets.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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