In part (a) of the figure an electron is shot directly away from a uniformly charged plastic sheet, at speed v, = 3.40 × 105 m/s. The sheet is nonconducting, flat, and very large. Part (b) of the figure gives the electron's vertical velocity component v versus time t until the return to the launch point. What is the sheet's surface charge density? Assume t, = 22.0 ps. 1 (ps) (a) (b) Number i Units v (105 m/s)

In part (a) of the figure an electron is shot directly away from a uniformly charged plastic sheet, at speed v, = 3.40 × 105 m/s. The sheet is nonconducting, flat, and very large. Part (b) of the figure gives the electron's vertical velocity component v versus time t until the return to the launch point. What is the sheet's surface charge density? Assume t, = 22.0 ps. 1 (ps) (a) (b) Number i Units v (105 m/s)