1 . 某实验小组为了测量一金属杆的电阻,设计了如图所示的电路,所用器材如下:
恒定,内阻
),
电阻箱
(最大阻值
),
电阻
(阻值为
),
电阻
(阻值为
),
毫安表mA(量程30.0mA,内阻不计),
待测金属杆,开关S,导线若干。
请完成下列实验操作和计算:
(1)根据如图所示实验原理图连接电路,闭合开关S,调节电阻箱
的阻值为
,此时毫安表示数为24.0mA,则金属杆中的电流为________ mA;
(2)重复以上步骤,调节电阻箱
的阻值为
,此时毫安表示数为20.0mA;
(3)断开开关,根据上述测量,计算得到待测金属杆电阻为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c1313842b62428737610b14806d883.png)
________
,同时可得到所用电源电动势为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a10353eb53b3fbac1a0c0734d95f0a0.png)
________ V。
(4)若电源长期使用后,电源电动势不变、内阻增大,则金属杆电阻的测量值将_________ 真实值(选填“大于”“小于”或“等于”)。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd4739c5b3aaa51b2d7413f9ada1a375.png)
电阻箱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b74b7eb6b2ebdbc770d8b118c2b48ab1.png)
电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c022b9237bacc316952ecb7b686275c8.png)
电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c095034f0b577b4ff83e1893a5ba22cb.png)
毫安表mA(量程30.0mA,内阻不计),
待测金属杆,开关S,导线若干。
请完成下列实验操作和计算:
(1)根据如图所示实验原理图连接电路,闭合开关S,调节电阻箱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9bbff121ec6c8ca1f9efe4c399d7d14.png)
(2)重复以上步骤,调节电阻箱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c022b9237bacc316952ecb7b686275c8.png)
(3)断开开关,根据上述测量,计算得到待测金属杆电阻为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c1313842b62428737610b14806d883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a10353eb53b3fbac1a0c0734d95f0a0.png)
(4)若电源长期使用后,电源电动势不变、内阻增大,则金属杆电阻的测量值将
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名校
2 . 有关原子物理、原子核物理的基本知识,下列说法正确的是( )
A.当![]() ![]() |
B.![]() ![]() |
C.核反应方程式![]() ![]() |
D.![]() ![]() |
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3 . 在篮球比赛中,篮球出手时的速度和角度都会影响投篮的命中率。如图所示,在某次投篮训练中运动员跳起投篮,投球点与篮筐在同一水平面上且相距x,篮球进入篮筐时速度方向与水平方向成α角,重力加速度为g,忽略空气阻力。下列说法正确的是( )
A.篮球进入篮筐时的速度大小为![]() |
B.篮球进入篮筐时的速度大小为![]() |
C.篮球从抛出到进入篮筐用时为![]() |
D.篮球从抛出到进入篮筐用时为![]() |
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4 . 中国的新一代人造太阳“中国环流三号”已经实现100万安培等离子体电流下的高约束模式运行,为可控核聚变的最终实现又向前迈出了重要一步。发生核聚变的一种核反应方程为
,关于该核反应下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aee2f15ebcbd3e08c6bd3300424303c.png)
A.X为电子 |
B.该核反应可以在常温下进行 |
C.该核反应过程中没有质量亏损 |
D.![]() ![]() |
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5 . 实验室有下列器材:直流电源(
,允许最大电流
)、电流表
(量程
,内阻约
)、电流表
(量程
,内阻约
)、电压表(量程
,内阻约
)、电阻箱
、滑动变阻器
(最大阻值
)、滑动变阻器
(最大阻值
)、开关和导线若干。
的内阻,电路如图甲所示,测得电压表
的示数为
,电流表
的示数为
,电阻箱旋钮位置如图乙所示,则电流表
的内阻![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e43e4425453bd6c57b9ef8623e40fb7.png)
_______
(结果保留三位有效数字);
(2)为了将电流表
改装为量程为
的电压表,该学习小组将电阻箱
与电流表
串联,则应将电阻箱
的阻值调为________
;
(3)将改装好的电表连接成如图丙所示的电路测量待测电阻
的阻值。
①按照图丙电路,用笔画线表示导线,将图丁中实物图连接完整____ ;
②调节滑动变阻器
的滑片,得到多组电流表
的示数
和电流表
的示数
,绘制出如图戊所示的
图像,由
图像可得待测电阻的阻值![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c1313842b62428737610b14806d883.png)
_______
。(结果保留三位有效数字)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5363e742a55322aba4edc7b1be405b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73c327d0f1396ddc8f8a4c1662cd626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e96476c8af1777a77e4011758847158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2d4775108dbaaf447c51fe18b088c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24727eaecb640cd9d4e6e4c445bc43c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9fd79de5050f5960c9478154c48e830.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df96275f5695e14314021da513622df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/749c847238b98f54dc54e910919cc1d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a14721595a37ee568f4e4926b262229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5f1fe6ee05f731ebd915bfa534dd50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2c4640b2bee411935f588fc5433c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d757a8853133814c9a9753443c1cf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478abdd84506a8ef759e353a238db6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10ca242d4501895bda5068dee10dd5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd2fd905a3d76f23e67fe0714a737ef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e43e4425453bd6c57b9ef8623e40fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
(2)为了将电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/837f3cec443d2a16c18d852450428368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
(3)将改装好的电表连接成如图丙所示的电路测量待测电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
①按照图丙电路,用笔画线表示导线,将图丁中实物图连接完整
②调节滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2c4640b2bee411935f588fc5433c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1ac49b4139636fb1809fe970b23a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1a0fd1ad044a9ecfcba672779bd678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4212457a633802e1f3e95466543cc9d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4212457a633802e1f3e95466543cc9d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c1313842b62428737610b14806d883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
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6 . 一条长为
的细灯带AB置于一水池中,
端到水面的竖直高度为
,
端到水面的竖直高度为
,水对灯带发出的光的折射率为
。
端在水面照亮的光斑半径为
,
端在水面照亮的光斑半径为
,水面上产生光斑的面积为
。下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307aae2cb625cd5206ce76e21e24540c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b8b26f0eb807c4f2a6a4de36145f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/122fc10d49eacb9aa36bff6d7f0652f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e533e34d363edf156cd20b180a291546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20fbe736e873d5cc2598b58e3512f22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 光电传感器是根据光电效应,利用光电转换元件将光信号转换成电信号的器件,光电传感器中金属的极限频率为
。两种频率分别为
和
的单色光分别通过同一双缝干涉装置,形成的干涉条纹分别如图中Ⅰ和Ⅱ所示。两种单色光中只有一种能使光电传感器中的金属发生光电效应,则
、
、
的大小关系为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d61ed8045f1d1cfa1f644d5d8b62c5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c73e8e6fc0cc92ad85bf7ef01a8cab1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc48546747c080a1a084d0da63171208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d61ed8045f1d1cfa1f644d5d8b62c5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c73e8e6fc0cc92ad85bf7ef01a8cab1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc48546747c080a1a084d0da63171208.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 如图所示,一矩形玻璃砖
,
边长为
,
边长为
,
为
边的中点,一光屏紧贴玻璃砖右侧
竖直放置。现有一红色光源从玻璃砖底部
点沿
方向射出一细光束,光束与
边夹角为60°,恰好在光屏上的
点接收到该光束,
点到
点的距离为
。下列有关说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31450f57809b2ae589ad6419e46f1645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08400f8bd1f5b4c044fe6b911f31ee3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d916a406adac9fa4dcfbad152547ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7babea9725f1c14b213b05f603b8251b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08400f8bd1f5b4c044fe6b911f31ee3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7babea9725f1c14b213b05f603b8251b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cfef623a9534b5708df5f95f1760a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08400f8bd1f5b4c044fe6b911f31ee3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
A.该玻璃砖对红光的折射率![]() |
B.红光从玻璃砖射出前后,频率不变、速率变大 |
C.将光源移动到![]() ![]() ![]() |
D.在![]() ![]() ![]() |
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9 . 水袖舞是中国京剧的特技之一,演员通过对水袖的运用来刻画人物。某次表演中演员甩出水袖的波浪可简化为如图乙所示沿x轴方向传播的简谐横波,其中实线为
时刻的波形图,虚线为
时刻的波形图,波的周期大于0.5s,关于该列简谐波,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38a296351b27d1bae8d1222ea8afcd3b.png)
A.波沿x轴负方向传播 |
B.演员手的振动频率为1.2Hz |
C.波传播的速度大小为2.5m/s |
D.若演员手的振动加快,则形成的简谐波波长变长 |
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10 . 如图所示,两根直杆竖直固定,一条长为2L的轻绳,两端分别拴在杆上的P、Q点,在绳的中点O拴吊一个质量为m的小球,P、Q在同一水平线上,两杆间距离为1.5L,重力加速度为g,现用力拉着绳的右端沿右侧杆缓慢向上移动
的距离,此过程中,拉力做功为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f806590de162bd04286a22010cfb45.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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