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What is the speed of X-rays in a vacuum? Express your answer to one significant figure and include the appropriate units. I'm unsure if my

What is the speed of X-rays in a vacuum? Express your answer to one significant figure and include the appropriate units.

I'm unsure if my answer or units were wrong. I tried both 186,000 m/s and 186,000 mi/s. The latter was not even considered an answer to the question apparently.

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