2016 Beijing Question 1 Single-choice Differentiating 2016_北京卷 (物理) 1. (6分) 处于$n=3$能级的大量氢原子, 向低能级跃迁时, 辐射光的频率有 ( ) A. 1种B. 2种C. 3种D. 4种 Answer keyC ☆ SaveCan't do it, show the explanation查看原卷 →