Suppose That at a Certain Time a Quanton Has a Well-Defined

Multiple Choice

Suppose that at a certain time a quanton has a well-defined position $x=0.15 \mathrm{~nm}$ . At that time, we perform an experiment to determine the quanton's momentum, and find it has a value that corresponds to a de Broglie wavelength of $0.45 \mathrm{~nm}$ to a high degree of precision. What can we say about the quanton's position after the experiment?

A) It is still $0.15 \mathrm{~nm}$ .
B) It is now $0.45 \mathrm{~nm}$ .
C) It is now within $\pm 0.45 \mathrm{~nm}$ of $0.15 \mathrm{~nm}$ .
D) It is now undefined but probably close to $0.15 \mathrm{~nm}$ .
E) It is now completely undefined.
F) Other (specify) .