Problem: A spaceship flies at a speed of 0.4c towards a stationary mirror. The ship sends a laserbeam at a wavelength of 500 nm towards the mirror, which reflects back towards the ship. What wavelength of light does the ship measure coming off of the mirror?

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A spaceship flies at a speed of 0.4c towards a stationary mirror. The ship sends a laserbeam at a wavelength of 500 nm towards the mirror, which reflects back towards the ship. What wavelength of light does the ship measure coming off of the mirror?

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