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习题练习：Half-life and decay constant
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 作者: admin  发布日期: 2024-08-05 18:06    总分: 10分  得分: _____________

答题人: 匿名未登录  开始时间: 24年08月05日 18:06  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  94.24: A sample of rad.0u aecu zyim. fk:u-q8-rq -jioactive material has an initial activity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 counts/minute. The half-life -quuek a .:imr.z--c quj0fy8of the material is:

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.22: A radioactive element has a half-life of 4.0 ho q4)arhhbo dyq.-ay7*/zam(, 6plassurs. Approximately how much of the radioactive,pdl- 4 7 / moy(yh aaqrq6aasz.)*bhs element will remain after 12.0 hours?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.25: Originally there are N atoms of an unhbkum2myy,3tig-j daq;x )o 2ups2:4 stable isotope. After 20 minutes, only q2-mj4 bs px id ,kgay3h2uu2t)y:;om1/16 of them have not decayed. What is the half life of the isotope?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.17: If 25% of a sample of a radioadxx0m1v*neh 1 ctive isotope decays in 4 hours, we would estimate the sample's half life d nhxv*xem110to be about

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.06: Radon gas emits gamma rays and is used in hospi7e h+my,uzm)cese fo-la46f7 tals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentage left after 19 days wcse,-zya) u6l4meofmf 7e7 +hill be about

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.50: A gas undergoes radioactive decay with ti(5w8k lvo2ca0yqq nyq6 5gd f7me constant $\tau$. A sample of 10000 particles is put into a container. After one time constant has passed, the experimenter places another 10000 particles into the original container. How much time passes from the addition of the particles until the container of gas reaches 10000 total particles again?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.47: A radioactive sample decays with a half-life om.w9h:0zag myqd/ 5zb f 2.0 yr. Approximately how much time must pass so that only 1/3 of the original sample remains .wh/ 0 gbzzqdamym5:9?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.44: A radioactive sample of gas has a half-life gr:o1g7f vjbl du o5.f*thj*6 of 100 seconds. If there are initially 10000 of these gas molecules in a closed container, approximately how many of the molecules rfj1lj*5rubdgv*t7h f o .6 og:emain after a time of 250 seconds elapses?

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A hypothetical radioactive substance Aapt,i6jh f, nk:* j1wgspoinium decays via alpha-emission into Physicsbowlium. The decay constant for this alpha-emission is js,fp*,:g h6 i1jwnko 20 $s^{-1}$.
12.41: Which one of the following statements correctly compares Physicsbowlium to Aaptinium?

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A hypothetical radioactive substance Aaptinium decays via alpha-emissdck97l cam9wm/w oi- *;p dvwh-6+isfion into Physicsbowlium. The decay constant for this alpha-emissio*api ikw l+wf;9dhc -modv/97c sm-6w n is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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