题目

A young boy was hungry for success. For him, winning was everything.One day, the boy was preparing himself for a running competition in his small village. He was to compete with two other young boys. A large crowd gathered there to watch, including a wise old man.The race began. With his strength and power, the boy easily took the lead. The crowd cheered and waved. The little boy felt proud and important. However, the wise man remained still and caim.“Another race, another race!” yelled the little boy. The wise old man stepped forward and presented the little boy with two new challengers: 11．如图所示为氢原子能级的示意图，现有大量的氢原子处于n=4的激发态，当向低能级跃迁时辐射出若干不同频率的光．关于这些光，下列说法正确的是（　　）A．这些氢原子总共可辐射出3种不同频率的光B．由n=2能级跃迁到n=1能级电子动能增加C．波长最大的光是由n=4能级跃迁到n=1能级产生的D．频率最小的光是由n=2能级跃迁到n=1能级产生的