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氢原子处于基态时，原子的能级为E1 =－13.6eV，普郎克常量h = 6.63×10－34J·s，氢原子在n = 4的激发态时，问：

（1）要使氢原子电离，入射光子的最小能量是多少？

（2）能放出的光子的最大能量是多少？

答案

（1）0.85eV

（2）12.75eV

1）

使氢原子电离需要的最小能量E = 0.85eV

（2）从n = 4能级跃迁到n = 1能级时，辐射的光子能量最大

△E = E4－E1 = 12.75eV

单项选择题

Object-oriented analysis （OOA） is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is （） . It determines how the various results are computed by the product and presents this information in the form of a （） and associated scenarios. The second is （） , which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The last step is （） , which determines the actions performed by or to each class or subclass and presents this information in the form of （）.

which determines the actions performed by or to each class or subclass and presents this information in the form of （）.

A．activity diagram

B．component diagram

C．sequence diagram

D．state diagram
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单项选择题

世界贸易组织《与贸易有关的知识产权协定》（TRIPS）是迄今为止最具综合性的知识产权多边协议，其中规定了（）的知识产权。

A.集成电路布图设计

B.实用新型

C.植物新品种
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