读“四个大洲轮廓图”，完成下题．

如图所示为氢原子的能级示意图，一群氢原子处于n=3的激发态，在向较低能级跃迁的过程中向外发出光子，用这些光照射逸出功为2.49eV的金属钠，下列说法正确的是（）

根据短文内容完成句子。

   The programmes Sun Xiaomei hosts might be among the shortest on CCTV. On Screen Next Week is on once a week for 15 minutes, and TV You, He and I comes on for five minutes each time once a week too. “Though these programmes are short, I have many ideas to make them more lively for the audience,” she said.

   Sun was interested in music in her childhood. She played the violin since the age of five until she finished middle school. At first her father wanted her to enter a music school; however, 16-year-old Sun Xiaomei became a student in Beijing Broadcasting College.

   Sun loves her job as a hostess very much. She pays great attention to learning from her comrades(同事), especially Zhao Zhongxiang. When Zhao Zhongxiang hosted The World and The Animal World, Sun would sit beside him to learn.

 “I am sure that when I am seen by hundreds of millions of audience on the weekend, I can make friends with them through my warm and easy talk,” she said.

若函数$f\left(x\right)=x^2+ax+b$有两个不同的零点$x_1,x_2$，且$1<x_1<x_2<3$，那么在$f\left(x_1\right),f\left(x_2\right)$两个函数值中               (     )