What is the speed of light in air?
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A.
3 x 10^6 m/s
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B.
3 x 10^8 m/s
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C.
3 x 10^⁴ m/s
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D.
3 x 105^⁵ m/s
Correct Answer:
B. 3 x 10^8 m/s
Explanation:
The speed of light in a vacuum is a fundamental physical constant approximately equal to 3 x 10^8 m/s (exactly 299,792,458 m/s). While light slows down slightly when passing through transparent media like air due to the refractive index, this change is minimal—roughly 0.03% slower than in a vacuum. Therefore, for most scientific calculations and general contexts, the speed of light in air is approximated as 3 x 10^8 m/s. Based on the provided options, 3 x 10^8 m/s (Option B) is the correct standard approximation.
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