Quote:
Originally posted by Grady Clay
For the less shifty crowd:
Lets say your decal is emitting red at 650 nm and the speeder observes it as blue at 450 nm.
ëemitted – ëobserved)/(ëemitted) =~ v/c where ë = lambda
v =~ 0.308 c ignoring special relativestic effects
v =~ (0.308) * (3 x 10^8 m/sec) = 9.2 x 10^7 m/sec
v =~ 210,000,000 miles per hour closing speed.  Doppler blueshift officer, the light wasn’t red.
Best,
Grady
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Grady, Grady, Grady...
You are never going to convince a cop that you thought the light was blue. It would be much more convincing to tell him that the light was still yellow.
Could you recalculate this for 590 nm? That would be a bit more useful.