$091\mathrm{.}7$ Suppose that at a certain time a quanton has a well$-$defined wavelength of $0\mathrm{.}15$ nm$.$ At that time, we perform an experiment to locate the quanton and get the nult

x $=0\mathrm{.}45$ nm to a high degree of precision. What can we say

about the wavelength of the quanton's wavefunction after the experiment?

$$It is still $0\mathrm{.}15$ nm$.$

$$It is now $0\mathrm{.}30$ nm$.$

$$It is now $0\mathrm{.}45$ nm$.$

$$It is now not well$-$defined.

$$Other $($specify$)..$