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A pulsar is a collapsed, rotating star that sends out a narrow beam of radiation, like the light from a lighthouse. With each revolution, we see a brief, intense pulse of radiation from the pulsar. Suppose a pulsar is receding directly away from Earth with a speed of 0.810c, and the starship Endeavor is sent out toward the pulsar with a speed of 0.940c relative to Earth.

a. If an observer on Earth finds that 155 pulses are emitted by the pulsar every second, at what rate does an observer on the Endeavor see pulses emitted? answer in pulse/sec

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