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Astronaut Alice is traveling from Earth to Barnard's Star at v = 0.866c as measured relative to Earth, while her twin Bob stays on Earth.

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Astronaut Alice is traveling from Earth to Barnard's Star at v = 0.866c as measured relative to Earth, while her twin Bob stays on Earth. Bob has a beacon which emits radio waves of frequency 3 MHz (as measured by Bob), which he uses to send messages to Alice. . What is the wavelength of the radio wave in Bob's frame? (2 pts)

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