How fast should a car move for the driver to perceive a red traffic light (λ≈0.70μm)(\lambda \approx 0.70 \mu \mathrm{m})(λ≈0.70μm) as a green one (λ′≈0.55μm)?\left(\lambda^{\prime} \approx 0.55 \mu \mathrm{m}\right) ?(λ′≈0.55μm)?
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