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For DeBrogile's and other like equations, you have to read the question and what it ask for, and sometimes you might have to combine two equations to get the desired value that you look for. But for DeBrogile's equation you use it for anything that has mass and behaves like a wave.
The equation is only practically used for objects that have an observable wavelength. Since objects like cars have a velocity and mass, and therefore momentum, they have a wavelength when plugged into the equation. But, since the mass of the car is too great, the momentum is too high and the wavelength is not observable. The wavelength needs to be within the angstrom (1x10^-10m) range to be observable from what Lavelle said.
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