Sue and Lou are observing a traffic light. Sue is standing on the side of the ro

Question

Sue and Lou are observing a traffic light.
Sue is standing on the side of the road, and says the light is red( = 700nm). Lou is in a car driving towards the light and says the lightis green ( = 530nm). How fast is Lou moving?? Please help, will rate lifesaver. The solution is supposed tobe .876*c but i cant figure it out. Sue and Lou are observing a traffic light.
Sue is standing on the side of the road, and says the light is red( = 700nm). Lou is in a car driving towards the light and says the lightis green ( = 530nm). How fast is Lou moving?? Please help, will rate lifesaver. The solution is supposed tobe .876*c but i cant figure it out.

Explanation / Answer

Since the observer is moving 'towards' the light source, blue-shift occurs. Thus the equation is: b = c/(c + vb) (whereb is the observed wavelength) vb = c(/b 1)----derived from the above...         =c(700/530 -1 ) vb=0.32c sorry, but the equations give this answer, they can't bewrong...

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