(5-4)  Using the de Broglie equation,  if Cormorant’s wavelength is 20 cm, his momentum would then have to be:

p  =  h / λ    =  6.626 x 10-34 / 0.20  =   3.3 x 10-33 kgms-1

So he would have to fly with a velocity,  v =  p / m   =  3.3 x 10-33 / 2.5  =  1.3 x 10-33 ms-1.

The distance he would then have managed to fly in the entire lifetime of the universe to date is therefore:

                          Distance = speed x time = 1.3 x 10-33 x 4.3 x 1017  =  5.6 x 10-16 m

This means that in order to have a reasonable expectation of being diffracted, Cormorant’s velocity would have to be so small that he would cover a distance of around one millionth of the width of a hydrogen atom during the lifetime of the universe. That’s quite slow.