Why does the Sun appear red at sunset and sunrise?
Correct answer: C. During sunset, the sun's rays travel through more atmosphere, scattering shorter wavelengths and leaving red light to dominate.
- A. The Sun's nuclear reactions change intensity at sunset, altering its color to red.
- B. The Sun emits different colors from different areas, and at sunset, we see the red part.
- C. During sunset, the sun's rays travel through more atmosphere, scattering shorter wavelengths and leaving red light to dominate.
- D. Plants emit red pigments at sunset, which color the sky red.
Explanation
The Sun appears red at sunset and sunrise due to the scattering of light in the Earth's atmosphere. As the Sun is close to the horizon, its light has to pass through a larger thickness of the atmosphere. Shorter wavelengths of light (like blue and violet) are scattered out, leaving primarily the longer wavelengths, such as red and orange, to reach the observer's eyes. This is why the Sun appears red. The other options are incorrect because they either misunderstand the nature of the Sun or incorrectly attribute the sky's color to unrelated factors.
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