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 in the y-direction then for a majority of electrons passing through the slit (h is Planck's constant):

• A. \[|{{P}_{y}}|>h\]
• B. \[|{{P}_{y}}|<h\]
• C. \[|{{P}_{y}}|=h\]
• D. \[|{{P}_{y}}|>>h\,\]