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).

Question

Quizplus · Accepted Answer

After the experiment, the wavelength of the quanton's wave function is not well-defined due to the Heisenberg uncertainty principle, which states that the more precisely the position of a particle is known, the less precisely its momentum (and thus its wavelength) can be known.

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