已知一群氢原子处于量子数n=4的激发态,如图所示.这些氢原子能够自发地跃迁到较低的能量状态,并向外辐射多种频率的光.能量大于或则等于2.60eV的光有( )
A:一种
B:二种
C:三种
D:四种
We should the used water clean before it goes back into the sea.