Which of these would be a testable hypothesis for the question “Why does the sky appear blue?”?
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A. The sky appears blue because blue is prettier than green. B. The sky appears blue because God has blue eyes, and the sky is God's eye. C. The sky appears blue because there is a sheet of transparent, blue plastic 500 feet above the Earth's surface. The sky is actually white beyond this sheet of plastic. D. The sky appears blue because although it is really green, it turns blue anytime anyone looks or measures it. E. None of the above are testable hypotheses.
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Answer:
"C" is the only testable hypothesis for your question. It's the only theory that CAN be tested. However, the sky is blue due to the abundance of nitrogen in our atmosphere. Nitrogen refracts and scatters Blue wavelengths of sunlight more than any other visible color. I hope this helps. Good luck!
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Other answers
A. Different folks have different ideas on what they consider to be pretty. There's no set standard for 'prettiness' that we could test even if we wanted to. B. I can't think of a way to measure God. If you could, you'd have a bigger story than just finding out why the sky is blue. C. An observable material, a quantifiable measurement, and a prediction. All of these are testable. D. It would be quite difficult to test something if you can't observe or measure it. E. We've eliminated A, B, and D, but not C.
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