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例(2010江苏卷)制备纳米薄膜装置的工作电极可简化为真空中间距为d的两平行极板,如图1所示,加在极板A、B间的电压U_AB作周期性变化,其正向电压为U_0~9,反向电压为-kU_0(k>1),电压变化的周期为2τ,如图2所示.在τ=0时,极板B附近的一个电子,质量为m、电
Example (2010 Jiangsu volume) Preparation of nano-thin film device working electrode can be simplified as the vacuum gap d two parallel plates, shown in Figure 1, plus the voltage between the plates A, B U_AB cyclical changes, which The forward voltage is U_0 ~ 9, the reverse voltage is -kU_0 (k> 1) and the period of voltage change is 2τ, as shown in Fig. 2. At τ = 0, one electron near plate B has mass m ,Electricity