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i'm a heavy text-er and have currently use a old hand me down blackberry curve with no internet service (data plan) on it. i want to purchase a blackberry bold 9700 but i can't do so at my local AT&T because it comes with the data plan. is there any way i could buy a blackberry bold 9700 (the...

Imagine driving down a street toward a traffic light. How fast would you have to go so that the red light (700 nm) would appear green (500 nm)? What fraction os this of the speed of light, c (c = 300,000 km/s)? could you explain step by step so that i can understand how to find the answer. thanks.