A physics professor claims in court that the reason hewent through the red light (λ = 650 nm) was that, due tohis motion, the red color was Doppler shifted to green(λ = 550 nm). How fast was he going?

Name: A physics professor claims in court that the reason he went through the red light (λ = 650 nm) was that, due to his motion, the red color was Doppler shifted to green (λ = 550 nm).…
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The observed wavelength will increase when there is relative motion between the observer and the…

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A physics professor claims in court that the reason he went through the red light (λ = 650 nm) was that, due to his motion, the red color was Doppler shifted to green (λ = 550 nm). How fast was he going?