A man was pulled over by the police for running a red light. "I think I know what happened, officer," said the man. "As I was approaching the stoplight, the speed of my car made the light appear Doppler-shifted. The red light thus appeared to be green from my point of view. So, you see, I don't think I should get the speeding ticket." If Mr. Speedy-pants was telling the truth, how fast must have been traveling? Would you give him a ticket? (Assume the wavelength of green light is 5000 A and the wavelength of red light is
6500 A.)