A parallel beam of electrons travelling in x-direction falls on a slit of width d (see figure). If after passing the slit, an electron acquires momentum $P_y$ in the y-direction then for a majority of electrons passing through the slit (h is Planck’s constant) :

Question

$\begin{array}{1 1} |P_y|d \approx h \\ |P_y|d > h \\ |P_y|d < h \\ |P_y|d >> h \end{array} $