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An astronaut is traveling in a space ship that has a speed of 0.99c relative to the Earth. The astronaut measures his pulse rate at 75 beats per...

An astronaut is traveling in a space ship that has a speed of 0.99c
relative to the Earth. The astronaut measures his pulse rate at 75
beats per minute. Signals generated by the pulse rate are radioed to
Earth. What pulse rate does the Earth observer measure?

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