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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): |
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Answer» `|p_y|d = h` From de-Broglie `lambda = h/(|p_y|)` From the concept of DIFFRACTION,  `Delta x = d sin theta` `lambda = d sin theta` `:. sin theta = lambda/d < 1` For diffraction , `lambda < d` `h/(|p_y|) < d` `:. |py| d > h` |
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