You are strapped into a rear-facing seat at the middle of a long bus accelerating from rest at about 10 m/s2 (a rather violent acceleration for a bus). As the back of the bus passes a warning sign alongside the street, a red light of precisely 650 nm wavelength on the sign turns on. Do you see this precise 650 nm wavelength? Does your friend sitting at the front of the bus see the wavelength you see? How could the same observations be produced with the bus and sign stationary?
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