Why does the Sun appear red at sunset and sunrise?
Correct answer: A. During sunset, the sun's rays travel through more atmosphere, scattering shorter wavelengths and leaving red light to dominate.
- A. During sunset, the sun's rays travel through more atmosphere, scattering shorter wavelengths and leaving red light to dominate.
- B. The Sun emits different colors from different areas, and at sunset, we see the red part.
- C. The Sun's nuclear reactions change intensity at sunset, altering its color to red.
- 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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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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