①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c25dd01fb17a7f3a8b16dcd21b44c90.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0e1390d52405adcb7876a48a755db2.png)
(1)写出原子核
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(2)已知原子核
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280c6d4aed9772c370eb32f384ee697e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f081d58d80a0a6c3fe3151f3e0701717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f07f08b9bb9ffc11398b36c0a30df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c8ce54a9304085f69d8bd217fba821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f504f058da5067f8f94145d821a639f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cae8a5fcc6b3c7255541e4ae6c42201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5838a12765993e31f631841e600f2d1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702146920b03e803285d854e442c71f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(3)用上述辐射中产生的波长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f69c82435f53d714bb756578bd0029.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4c201cc9e3792388e93671d8f7cdee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f454c8e53bda61fdb981364eaed4e84f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84543e28295f44b2b53430e77950923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631a84902ccb96b6561abd3701737344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
相似题推荐
【推荐1】研究光电效应的装置如甲图所示,该装置可用于分析光子的信息。在xOy平面(纸面)内,垂直纸面的金属薄板M、N与y轴平行放置,板N中间有一小孔,坐标为
。第一象限存在垂直向里的匀强磁场,x轴
处有小孔
,平行板电容器A,K的上极板与x轴紧靠且平行,其长度为L,板间距为
,A板中央小孔
与
对齐,K板连接电流表后接地。在入射光的照射下,质量为m,电荷量为e的电子从M板逸出后经极板电压加速从
点持续不断进入磁场,速度大小在
与
之间,已知速度为
的电子经磁场偏转后恰能垂直x轴射入
点,板M的逸出功为W,普朗克常量为h。忽略电子之间的相互作用,电子到达边界或极板立即吸收并导走。
(1)求逸出光电子的最大初动能和入射光的频率;
(2)求匀强磁场的磁感应强度大小和所有能到达x轴上的电子在磁场中运动的最短时间;
(3)时,求到达K板最左端的电子刚从板M逸出时速度
的大小及与x轴的夹角
;
(4)若在小孔处增加一特殊装置,可使进入的电子沿各方向均匀分布在与
轴成0~90°范围内,速率在
与
之间。监测发现每秒钟有n个电子通过小孔
,调节加载在k与A板之间的电压
,试在乙图中大致画出流过电流表的电流i随
变化的关系曲线。标出相关数据,写出必要的计算过程。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/3/04e1f280-e2f7-4581-a848-24864765ec19.png?resizew=373)
(1)给光电管两极加上电压
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52b4f24969673c863b5aff4fb6751ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23d96b9e0d40658127563525193bde4.png)
(2)图(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(Ⅰ)研究发现,要使电子能运动到阳极处,逸出时的速度必须大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d85d1f737d27270b9b824ff843b7194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(Ⅱ)进一步研究表明,阴阳两极没有同轴会造成到达阳极的光电子数目不同,小明拿到一个“次品”,其阳极比正常圆心位置向右偏离了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1129c716921187978632be73ab6bd565.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23d96b9e0d40658127563525193bde4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0291bbe0ccccc1cd14b5a20eb70c82f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef4a58829c5655fbf66fe583b903160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afbafae876d1abfcea6616b1abfdf7a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd5f9ecb870fedb5b9a608d9ca2f911.png)
(1)金属K的极限频率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a83155855212e0fd721e197d4d9567b.png)
(2)当电源提供正向电压时(如图乙所示),K、A之间的电场可看做匀强电场,为使从电极K中心逸出的光电子都能到达电极A,正向电压
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f833a7beb83820ecede0234c671f1878.png)
(3)假设在(2)的正向电压下,近似认为每个电子都以最大速度垂直打在电极A上,电子打在电极A上的速度瞬间变为0,电流表的示数为i,则单位时间内电极A受到的冲量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29acb83cbdc6b53f3974535b69ca42f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/ee2f3ee0-4f0b-4a66-aac0-4dd19daf67d2.png?resizew=475)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c09bf9312eb084dc7c471d6b84e9de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a49a03e3c35275533ace137e16d9ecb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c09bf9312eb084dc7c471d6b84e9de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328f893f1c1abeb08745037a209b9f5f.png)
(1)两个氘核(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a49a03e3c35275533ace137e16d9ecb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9169190b96c1842d24faade78fec7d58.png)
(2)核聚变材料氕核(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c09bf9312eb084dc7c471d6b84e9de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a49a03e3c35275533ace137e16d9ecb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38a8beaa27b75a4d5588048bf67df30.png)
(3)若环形磁场区域内磁场的磁感应强度为B0,氕核(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c09bf9312eb084dc7c471d6b84e9de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c09bf9312eb084dc7c471d6b84e9de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/6/21a404f7-e64b-46b6-a726-b4a6bf07a5c2.png?resizew=232)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82273c3230b48519e1e1e78d497d41b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15a59e24b24be8397b6ac7e0c169a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a097217a3449a388ba2d9f092a4b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9a4852d5dcd44fd3150b7c516d6049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc90e212c576cd109fb093d861f6d986.png)
(1)写出核反应方程;
(2)求核反应中释放的核能;
(3)在两氘核以相等的动能
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99930c690de20c3961fceb770921673e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9615953c04e98f7957bdbf1af6546f37.png)
(1)补充完成上述核反应方程;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a471268774eb647cd7c9530161a87b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c322844c0cef9679b53add5516f0ffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61fd15d871895d43e9d9ec6d4cf13d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d561dd2f5a293f967c7e227f4022e3e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c367ff4f72090b32d3988cfe962cbe57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37cfe90588dd2195cdc56c64e3b4e7f.png)
(3)设质子、中子的质量均为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b3e54d68452d7aec760d6865d18e95.png)
(1)核反应中释放的核能.
(2)在两个氘核以相等的动能0.35MeV进行对心碰撞,并且核能全部转化为机械能的情况下,求反应中产生的中子和氦核的动能.
(3)假设反应中产生的氦核沿直线向原来静止的碳核(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c66b1210e788047ad52a94421a73749.png)
例如玻尔建立的氢原子模型,仍把电子的运动看做经典力学描述下的轨道运动.即氢原子中的电子在库仑力的作用下,绕原子核做匀速圆周运动。已知电子质量为m,元电荷为e,静电力常量为k,氢原子处于基态时电子的轨道半径为r1。
①氢原子处于基态时,电子绕原子核运动,可等效为环形电流,求此等效电流值。
②氢原子的能量等于电子绕原子核运动的动能与电子和原子核系统的电势能之和.已知当取无穷远处电势为零时,点电荷电场中离场源电荷q为r处的电势φ=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e85d5c25e3bb47abe0db77e7ca5399.png)
(2)在微观领域,动量守恒定律和能量守恒定律依然适用。在轻核聚变的核反应中,两个氘核(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76a7911e55d1505d327764cd1e02bc59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6deab9845df2b8540fac2b9647f80ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba643c03218e2a6f651d8d07fef5f35a.png)
![](https://img.xkw.com/dksih/QBM/2017/5/15/1687362246033408/1691827986538496/STEM/5bf77f7f901546a5b8543e9c8c58045d.png?resizew=3)