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98年高考物理试卷第17题:来自质子源的质子(初速度为零),经一加速电压为800KV的直线加速器加速,形成电流强度为1mA的细柱形质子流。已知质子电荷e=1.60×10~(-19)C,这束质子流每秒打到靶上的质子数为____,假设分布在质子源到靶之间的加速电场是均匀的,在质子束中与质子源相距l和4l的两处,各取一段极短的相等长度的质子流,其中的质子数分
Physical Examination Paper for the 98th National College Entrance Exam Question 17: Protons from a proton source (the initial velocity is zero) are accelerated by a linear accelerator with an accelerating voltage of 800 kV to form a thin cylindrical proton flow with a current density of 1 mA. Knowing that the proton charge e=1.60×10-19 C, the number of protons hitting the target per second is ____. Assume that the accelerating electric field distributed between the proton source and the target is uniform. In the proton beam, two proton sources are separated from the proton source by 1 and 4 l. Each proton beam has a very short length of proton flow with the same number of protons.