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600burger

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A Cadillac with a mass of 2000 kg approaches a freeway underpass that is 10 m across. At what speed must the car be moving in order for it to have a wavelength such that it might diffract after passing through this "single slit"? Copmare to normal freeway speeds of ~30 m/s.

What I am not sure about is what should i assume its wavelength should be? Or how i find about what it should be. Since I am using l=h/m*v (where l is lambda/wavelength, h is planks, m is mass, and v is velocity) i solve for v, but to do that i must assume a wavelength. Anyone know what I am talking about?

Thanks,

Burg