On a futuristic highway, a 15-m-long rocket travels so fast that a red stoplight, with a wavelength

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On a futuristic highway, a 15-m-long rocket travels so fast that a red stoplight, with a wavelength of 700 nm, appears to the pilot to be a green light with a wavelength of 520 nm. What is the length of the rocket to an observer standing at the intersection as the rocket speeds through?

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