更多“ 电子静电波的色散关系为<img src="https://nimg.ppkao.com/2019-04/suhuan/2019042309452722595.jpg?sign=2e4b7e767bdbbb582b7ec56e9947e728&t=62d5bdc0" />。给出波的相速度和群速度；证明在大的波数k时，波的相速度和群速度相等，并给出其值。”相关的问题
A、A.<img src="https://img.ppkao.com/2018-08/yiyu/2018082216034241512.jpg" />
B.<img src="https://img.ppkao.com/2018-08/yiyu/2018082216034520234.jpg" />
C.<img src="https://img.ppkao.com/2018-08/yiyu/2018082216034811816.jpg" />
D.<img src="https://img.ppkao.com/2018-08/yiyu/2018082216035385003.jpg" />
A、A.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017091415453785428.jpg" />
B.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017091415454658417.jpg" />
C.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017091415455355241.jpg" />
D.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017091415455842834.jpg" />
A、如果算符<img src="https://img.ppkao.com/2019-04/liyunao/2019041013301694278.jpg" />满足<img src="https://img.ppkao.com/2019-04/liyunao/2019041013303038509.jpg" />关系式，求证
<img src="https://img.ppkao.com/2019-04/liyunao/2019041013303655462.jpg" />
A、下列电子构型的金属-金属多重键的键级为多少？
<img src="https://img.ppkao.com/2018-10/wenxueying/2018101217235674496.jpg" />
A、A.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017091517302826297.jpg" />
B.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017091517303719706.jpg" />
C.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017091517304272871.jpg" />
D.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017091517304721135.jpg" />
A、A.<img src="https://img.ppkao.com/2019-04/caoguanchen/2019041609525487654.png" />
B.<img src="https://img.ppkao.com/2019-04/caoguanchen/2019041609530141019.png" />
C.<img src="https://img.ppkao.com/2019-04/caoguanchen/2019041609531161285.png" />
D.<img src="https://img.ppkao.com/2019-04/caoguanchen/201904160953206705.png" />
A、如图所示，一个电子以速度v0垂直射入磁感应强度为B，宽为d的匀强磁场中，穿出磁场的速度方向与电子原来的入射方向的夹角为30°，（电子重力忽略不计）求
<img src="https://img.ppkao.com/2019-05/yuanhuijuan/2019050716425675787.jpg" />
A、A.<img src="https://img.ppkao.com/2016-02/xiaolei/2016022714023547405.jpg" />大调
B.D大调
C.<img src="https://img.ppkao.com/2016-02/xiaolei/2016022714023812208.jpg" />大调
D.A大调
A、A.2a2/R
B.2ha/p
C.<img src="https://img.ppkao.com/2019-04/wangjue/2019041115340520955.jpg" />
D.<img src="https://img.ppkao.com/2019-04/wangjue/2019041115340871713.jpg" />
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