Astronaut Is Traveling In Space

An astronaut is traveling in a space vehicle that has a speed of 0.500c relative to the Earth. The astronaut measures her pulse rate at 75.0 beats per minute. Signals generated by the astronaut’s pulse are radioed to Earth when the vehicle is moving in a direction perpendicular to the line that connects the vehicle with an observer on the Earth.
(a) What pulse rate does the Earth observer measure?
(b) What If? What would be the pulse rate if the speed of the space vehicle were increased to 0.990c?

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