您所在的当前位置：高中物理试题 >

原子核的衰变、半衰期

> 不定项选择火警的报警系统通常利用镅( 241 95Am)衰变成镎( 237 93Np)时放出一种很容易被空气阻隔的新粒子，这种粒子是（） A． 4 2He B． 1 1H C． 1 0n D． 0 1e

问题：

发布时间：2024-09-12

不定项选择火警的报警系统通常利用镅( ²⁴¹ ₉₅Am)衰变成镎( ²³⁷ ₉₃Np)时放出一种很容易被空气阻隔的新粒子，这种粒子是（） A． ⁴ ₂He
B． ¹ ₁H
C． ¹ ₀n
D． ⁰ ₁e

参考答案：

提问用户：E3***Mmp

可能感兴趣的题目：

1 听下面一段材料,回答第1至4题. 1. What does the man want to confirm? A. The woman"s educational background. B. The woman"s work experience. C. The woman"s nationality. 2. Where does the woman work now? A. In New York. B. In Singapore. C. In San Francisco. 3. How much is the woman"s present salary? A. ＄2,200. B. ＄2,280. C. ＄2,600. 4. What are the employees allowed to do for further education? A. Attend college night courses at the weekend. B. Go abroad to have further education every year. C. Take up six hours a week to attend college courses.
2 My uncle often _________ at the weekend． A.fishing B.goes fishing C.going fishing D.go fishes．
3 有学者指出：“在一系列战败之后，中国读书人逐渐被战胜者改变了思想方式，接受了以强弱分文野的新观念。这类因对抗性互动而产生的概念转移，急剧而彻底……对西方的认知，也从“夷务”到“洋务”再到“时务”，由贬义的“夷”到平等的“西”再到尊崇的“泰西”。说是天翻地覆的转变，也不为过。”以下表述不能体现材料观点的是 A．称呼演变：夷务到洋务 B．西方侵略使中国对世界的认知发生变化 C．由模仿到“走自己的路” D．对西学的看法：从鄙视到推崇
4 列宁对马克思主义的重大发展是 [ ] A．明确提出实行无产阶级专政的革命纲领 B．无产阶级使命是推翻资产阶级统治 C．无产阶级夺取政权后必须发展生产力 D．社会主义可以在一个资本主义国家首先取胜
5 . Mary was only too ready to help others, seldom, _____, refusing them when they turned to her. A．if never B．if not C．if any D．if ever
6 某金属导体两端的电压为24V，30s内有36C的电荷量通过导体的横截面，则：（1）每秒钟内有多少个自由电子通过该导体的横截面？（2）导体中的电流有多大？（3）该导体的电阻多大？
7 对下列地区景观描述，正确的是 A.内蒙古高原牛羊成群 B.珠江三角洲甜菜丰收 C.华北平原牦牛遍布 D.黄土高原稻花飘香
8 116. This pocket English dictionary cost me 2 US _____, that is more than 16 RMB _____. A．dollars; yuans B．dollar; yuan C．dollar; yuans D．dollars; yuan
9 阅读理解。 The Americans believe that anybody can become President of the United States. In a recent Hollywood comedy(喜剧), that is exactly what happens. Dave Kovic, played by Kevin Kline, is a kind-hearted man who runs a business that finds people jobs. He leads a typical(典型的) American way of life, except for one thing－he looks exactly like the President, Bill Mitchell. In fact, the only thing that makes him different from the nation"s leader is that he is very nice! The president has started using look-alikes during some public appearances. Dave is offered a chance to "serve his country" by becoming one. However, things go wrong. The President becomes very ill and Dave ends up acting as the President forever. Director Ivan Reitman, who made the popular and successful comedies like Twins, Ghostbusters and Legal Eagles, could have gone for easy laughs by making fun of the American government. Instead, Dave is an attractive comedy about an ordinary man in extraordinary situations. Kevin Kline gives a double performance as Dave and the President, and Sigourney Weaver is at her best as his First Lady. The love story that develops between her role and Dave is a real classic(经典). The film is 100% American. However, if you"ve ever felt that anybody could do a better job running the country than the people in power, then you"ll enjoy Dave! 1. What is the purpose of the text? A. To tell the reader about the American government. B. To discus the Americans" ideas about the President. C. To make a comparison between Dave and other films. D. To introduce a new film to the reader. 2. Who plays the role of the President in the film? A. Sigourney Weaver. B. Kevin Kline. C. Bill Mitchell. D. Ivan Reitman. 3. The underlined word " one" in the 3rd paragraph refers to _____. A. the President B. the director C. an actor D. a look-alike 4. Which of the following is best supported by the text? A. The author makes fun of the President. B. The author thinks highly of the film. C. The author is a fan of Hollywood comedies. D. The author wishes to become the American President.
10 Although they are twin sisters, they have nothing__________. A．in relief B．in peace C．in common D．in cash

不定项选择 火警的报警系统通常利用镅( 241 95Am)衰变成镎( 237 93Np)时放出一种很容易被空气阻隔的新粒子，这种粒子是（ ） A． 4 2He B． 1 1H C． 1 0n D． 0 1e

可能感兴趣的题目：

不定项选择火警的报警系统通常利用镅( ²⁴¹ ₉₅Am)衰变成镎( ²³⁷ ₉₃Np)时放出一种很容易被空气阻隔的新粒子，这种粒子是（） A． ⁴ ₂He
B． ¹ ₁H
C． ¹ ₀n
D． ⁰ ₁e