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 wavelength of $0.15 \mathrm{~nm}$ . At that time, we perform an experiment to locate the quanton and get the result $x=0.45 \mathrm{~nm}$ to a high degree of precision. What can we say about the wavelength of the quanton's wave function after the experiment?

A) It is still $0.15 \mathrm{~nm}$ .
B) It is now $0.30 \mathrm{~nm}$ .
C) It is now $0.45 \mathrm{~nm}$ .
D) It is now not well-defined.
E) Other (specify) .