the extent of localisation of a particle is determined roughly by its de broglie wavelength if an electron is localized - Physics - Dual Nature Of Radiation And Matter

Question

the extent of localisation of a particle is determined roughly
by its de broglie wavelength if an electron is localized within the
nucleus (of size of about 10^-14m) of an atom, what is its
energy?In the solution of this question wavelength is taken to
be10^-14m but i can't understand how size of nucleus is equal to
wavelength?

Kranav Sharma · Accepted Answer

Here we are trying to prove that electrons cannot reside within
the nucleus We can start by first considering that the wavelength
(or reach of an electron or its physical limits) is of the order of
the extent or diameter of the nucleus, this is done in order to
suppose that an electron resides inside the nucleus
Now, we have the associated energy of the electron as
E = hÎ½
and it comes out to be
E = 124 MeV
which is very large compared to the binding energy of the
nucleus, So, as the energy of electron in higher than the binding
energy of the nucleus we can conclude that no electron can reside
within a nucleus as it will not be able to hold a far more
energetic electron (like it does protons and neutrons)