[填空题]
A beam of electrons with enx+as*twl v .ped.x21dergy 45 kV is shot through tw90hi) bgouh4lwk,s* uo narrow slits in a barrier. The slits are a disb* )s,il9u oughk4w0h tance $2.0\times10^{-6}\ \text{m}$ apart. If a screen is placed 35.0 cm behind the barrier, calculate the spacing between the "bright" fringes of the interference pattern produced on the screen. $\Delta y =$ $\ \mu\text{m}$
