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## Homework Statement

I drive through a traffic light. When I was pulled over, I tell the police that the red light of wavelength 675 nm appear green to me, with a wavelength of 525 nm cause of doppler effect. How fast was I traveling?

## Homework Equations

[tex]\Delta[/tex] [tex]\lambda[/tex] / [tex]\lambda[/tex] = v/c

v is the speed that the source is receding, isn't it the same as the speed I am traveling?

## The Attempt at a Solution

v = c (675-525) /675

I just followed the equation to find v, but it was incorrect.

please help.