在氢原子中，对r = 53 pm 处的正确描述是 A: 该处为氢原子Bohr 半径 B: 该处是1s 电子云界面 C: r 是1s 径向分布函数的平均值 D: 氢原子处激发态时电子绕核核运动的轨道半径

在多电子原子中，具有下列各组量子数的电子中能量最高的是（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/cbe816173dce443198f2fc05a1431b71.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/26975a0bed514d82b261189249926e6a.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/96fd22cf5fd446ef9aae9b225aa7971f.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/780a9bc591144994887b5d03fe17b912.png" />

在均匀磁场B内放置一极薄的金属片，其红限波长为l₀。今用单色光照射，发现有电子放出，有些放出的电子(质量为m，电荷的绝对值为e)在垂直于磁场的平面内作半径为R的圆周运动，那末此照射光光子的能量是： A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/970ff7c27dde4e4b9eb4c4da14860b8d.png" /><img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/5594b507f8464bf7a374b7e5dcb0a069.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/981cae9ff5a7413098d20cab987dab87.png" /><img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/890ce6f198d646878b2f447800bca222.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/59c504d6bb264533b36a361fea171cfb.png" /><img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/fb453fc2b2fe4e26b43da757e738db33.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/25c06e7fcd54496cb20266ded5fab44f.png" />

无限长直导线在P处弯成半径为R的圆，当通以电流I时，则在圆心O点的磁感强度大小等于<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/247132caa86643248801a9ce73153643.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/d6ca935b43b5409982580c397b20452a.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/05df5ede8d854c86adb4aa49ab7d213a.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/fd586a02dd0d48d2a9d8451722bd0cc8.png" /> D: 0 E: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/5b15cee769754f5b8d999d9c5bb28961.png" />

如图所示电路的逻辑表达式F=（ ）。<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/8655693a417e4e43a32e0732ed533c96.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/beda73211aea49f082d9137fd4eb0526.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/7388c99ee0824f20bcf85893934a2f6a.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/9a5c81e78b344c79a9389e932a7f55ce.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/82193a9a030243728012b02e15718987.png" />