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太原市 2025 年高三年级模拟考试（二）
物理参考答案与评分建议
一、单项选择题：本题包含7小题，每小题4分，共28分。
题号 1 2 3 4 5 6 7
选项 D D A B C B B
二、多项选择题：本题包含3小题，每小题6分，共18分。
题号 8 9 10
选项 AC AC ABC
三、实验题：共16分。
11.（7分）
（1）10 （1分）
（2）50 （2分）
（3）不变 （1分） 越小 （1分）
（4）偏小 （2分）
12.（9分）
（1）R （1分）
1
（2）PTC（1分） NTC （1分）
（3）变小（2分）
（4）2.12（1分） 1.48（1分） 偏大（2分）
四、计算题：共38分。
13.（8分）
（1）光源1到亮纹的距离为r ，光源2到亮纹的距离为r ，光源1到r 的距离与两个光源
1 2 2
1距离的夹角为θ，若亮纹到光屏中心的距离为x
2a ··········································································（1分）
····················································································（1分）
2a ····················································································（1分）
····················································································（1分）
（2）五条连续亮纹间距为x=6cm，因为5条亮纹间有4个间距，相邻亮纹间距
=1.5cm=0.015m······································································（1分）
···················································································（1分）
λ=750nm·····················································································（2分）
14.（14分）
（1）M刚到达C点尚未与N发生碰撞时，对BC管道的压力恰好为0，此时M只受重力
···················································································（1分）
M由A到C，根据机械能守恒定律
··············································· （1分）
···························································（1分）
（2）M与N发生弹性正碰，碰撞过程中动量守恒、机械能守恒。
设碰撞后M的速度为 ，N的速度为v
·······································································（1分）
·································································（1分）
···················································································（1分）
（3）根据牛顿第二定律
2对于P: ································································ （1分）
对于Q: ···················································（1分）
对于P: ··························································（1分）
对于Q: ········································（1分）
······················································································（1分）
对于N: ·····························································（1分）
对于Q: ········································································（1分）
P与N右端的最大距离
··············································（1分）
15.（16分）
（1）设正离子经bc间电压加速后从d处喷出时的速度为v,
····························································（2分）
选取研究对象
- 0··········································· （2分）
·····························································（1分）
（2）根据动量定理，N车对离子的作用力为 ，以初速度方向为正
········································（2分）
······························································（2分）
=2F··································································（1分）
'
（3）正离子在磁场中做匀速圆周运动，洛伦兹力提供向心力，轨道半径R=2r
3··························································· （2分）
·························································（1分）
粒子扫过的面积如图中阴影部分所示
N车中匀强磁场区域垂直投影到纸面内的面积至少为
···································································（3分）
4
