please tell me the answer fast
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Answer:
option B
Explanation:
I think it's crt
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1
Answer:
b) A speed of light in a medium
Explanation:
In fact, the speed of light in a vacuum c is so important that it is accepted as one of the basic physical quantities and has the fixed value c = 2.9972458 × 108 m/s ≈ 3.00 × 108 m/s, where the approximate value of 3.00 × 108 m/s is used whenever three-digit accuracy is sufficient.
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