(a) As you accelerate your car away from a stoplight, does the de Broglie wavelength of the car increase, decrease, or stay the same?

(b) Choose the best explanation from among the following:

I. The de Broglie wavelength will increase because the momentum of the car has increased.

II. The momentum of the car increases. It follows that the de Broglie wavelength will decrease, because it is inversely proportional to the wavelength.

III. The de Broglie wavelength of the car depends only on its mass, which doesn't change by pulling away from the stoplight. Therefore, the de Broglie wavelength stays the same.