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1234567选项DDABCBB二、多项选择题：本题包含3小题，每小题6分，共18分。题号8910选项ACACABC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）R1（1分）（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r1，光源2到亮纹的距离为r2，光源1到r2的距离与两个光源1距离的夹角为θ，若亮纹到光屏中心的距离为x2a··········································································（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=2r3···························································（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