一道AP物理题How many different photon frequencies can be emitted if an electron is in excited state n=4 in a hydrogen atom?A 1B 3C 5D 6E 8

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一道AP物理题How many different photon frequencies can be emitted if an electron is in excited state n=4 in a hydrogen atom?A 1B 3C 5D 6E 8

一道AP物理题How many different photon frequencies can be emitted if an electron is in excited state n=4 in a hydrogen atom?A 1B 3C 5D 6E 8
一道AP物理题
How many different photon frequencies can be emitted if an electron is in excited state n=4 in a hydrogen atom?
A 1
B 3
C 5
D 6
E 8

一道AP物理题How many different photon frequencies can be emitted if an electron is in excited state n=4 in a hydrogen atom?A 1B 3C 5D 6E 8
选择 D.放出6种不同频率的光.
理由：
数学算法：C24,这个是组合算法啊,2在上面,4在下面.也可以用逐级连线法：即先从最上面的那个能级分别向下面的三个能级各画一条线,可画三条；再从第二条出发,分别向下面二个能级各画一条线,可画两条；再从第三能级出发,向下面一能级画一条线,可画一条.则总共可画6条.

一道AP物理题How many different photon frequencies can be emitted if an electron is in excited state n=4 in a hydrogen atom?A 1B 3C 5D 6E 8 AP物理题,英语学霸快来, AP chemistry (7)How many methods of physical methods of separation?本题不是英语翻译题. 一道物理题, 一道物理题, 一道物理题, 一道物理题, 一道物理题, 请教一道智力题：How many letters are there in English? how many how many, 200分求一道物理题 求懂英文的高手啊Strontium-89 is a radioactive isotope with an atomic number of 38.How many protons and how many neutrons are present in the nucleus of this isotope?Number of Protons =Number of Neutrons = 200分求一道物理题 求懂英文高手解答Suppose that we have 39936 atoms of a radioactive substance with a half-life of 3 hours. a. How many atoms of that element remain after 15 hours?Answer= 多少atomsb. How many atoms remain after 21 how many how 一道AP宏观经济 解一道初中物理题 求一道物理题 一道物理题,求思路