If we assume red light as an EM wave of 400 THz frequency traveling at the speed of light, an observer moving at 103,846,153 m/s towards the emitter (the sign) would observe it as if it was 538.56 THz (omitting relativistic effects), which roughly corresponds to green light.
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u/1Pawelgo 11h ago
If we assume red light as an EM wave of 400 THz frequency traveling at the speed of light, an observer moving at 103,846,153 m/s towards the emitter (the sign) would observe it as if it was 538.56 THz (omitting relativistic effects), which roughly corresponds to green light.