Okay, I don't need an answer . . . I just need to know how I would go about getting an answer. Here is the question, exactly worded as on my worksheet: "What is the up-doppler for a 600.0 nanometer laser scanning an innocent, law-abiding, safe-driving, tax-paying, completely innocent, God-fearing, innocent, motorcyclist closing this barely legal speed trap at a reasonable for conditions 198.00 km/hr? Use mega sig figs." I converted km/hr into m/s and got 55 m/s for the speed of the motorcycle. Now, for the up-doppler, would I take the 600 nanometer and multiply it by the velocity of sound over the quantity (velocity sound + velocity of source)? I am really confused.