Suppose a scientist places a sample of pure 239Pu in a safe container in her laboratory.She then flies to a distant star in a spaceship that can…

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Suppose a scientist places a sample of pure 239Pu in a safe container in her laboratory.She then flies to a distant star in a spaceship that can travel at nearly the speed of light. Once she returns to her laboratory, she discovers that the sample is now only 25%plutonium. How long was she gone as measured in the laboratory frame of reference?

 
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