河北省2023-2024学年度第二学期学业水平抽样评估(二)物理试卷答案试卷答案,炎德英才答案网站目前收集并整理关于河北省2023-2024学年度第二学期学业水平抽样评估(二)物理试卷答案试卷答案得系列试题及其答案，更多试题答案请关注我们

河北省2023-2024学年度第二学期学业水平抽样评估(二)物理试卷答案试卷答案

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河北省2023-2024学年度第二学期学业水平抽样评估(二)物理试卷答案第一部分

19.下列测量方案,最合理的是A.测小铁块密度:用装有适量水的量筒测体积后,再用天平测质量B.测正方体小木块密度:用天平测质量,再用刻度尺测边长并计算体积C.测小砖块密度:用天平测质量后,再用装有适量水的量筒测体积D.测比赛用铅球密度:用天平测质量后,再用装有适量水的量筒测体积

河北省2023-2024学年度第二学期学业水平抽样评估(二)物理试卷答案第二部分（待更新）

5.场离子显微镜技术是能够在某些金属表面上观察到单个原子的一种方法。其装置如图所示,球形玻璃泡的内壁涂有一层荧光材料制成的导电膜,针尖为被研究结构的样品,针尖的半径只有10nm,处在玻璃泡的球心。运用真空泵把玻璃泡内成接近真空的状态,在金属针尖上加高电压U,使针尖为负极,针尖上原子中的电子要克服金属表面的逸出功W被强电场剥夺,离开针尖的电子在电场力作用下向荧光质涂层移动,在涂层上产生的光斑便是针尖上原子分布的反映。已知电子质量为m,,带电荷量为e,,单位时间内有n个电子打到涂层上,打到涂层上后速率立即变为零。则电子A.从球心向荧光质涂层运动过程中做匀加速运动B.到达荧光质涂层时的速率为2eUmC.在运动过程中电势能和动能都变大D.打到荧光质涂层上时对涂层的作用力近似为F=n2(eU-W)m