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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 radioactive mabcl68+p( jhad terial has an initial activity of 10,000 counts/minute. 30 mh cdplb (a6j+8inutes later, its activity is 2,500 counts/minute. The half-life of 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 hours. Approximately how muc3zk500*rfvvghxu cy.h orxf03vyc k5 z0*vgh.u f the radioactive 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 ome,205 8p;vtbhxlt87)(ns u vxsi ch gf an unstable isotope. After 20 minutes, only 1/16ei2 ms0x,p) ;tch57 (tl8huvg8bxvsn 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 radioactive isotope decaafej) p+jw; xn6 bu9h/ys in 4 hours, we would estimatw9;jb6an+u)h/epjf x e the sample's half life to 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 mkyg +k ,)5d6la fj38esxvd-jz u):rkis used in hospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentage left:d)g 3ykjz6+-),l d ekxum raj8vksf5 after 19 days will 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 timesdf9k7l 0t lshd+ 12cjj ycg)/ 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 of 2.0 yrv:lwodgkbzfnf*(36g 5 ) :e gz. Approximately how much time must pass so that only 1/3 zg5gb k)nl:wzoe 3:g(6vf*df of the original sample remains?

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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 halfnlrs8j39o6e t-life of 100 seconds. If there are initially 10000 of these gas molecut er386jln9 soles in a closed container, approximately how many of the molecules remain 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 sga9d2ge bg.)zk w+ k84kf2z)70akrhk 0xxsmsubstance Aaptinium decays via alpha-emission into Physicsbxshkz k4bag) 27rkg.8 wmxe920kz+)ds0k fg a owlium. The decay constant for this alpha-emission is 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 substv62(f rnylkv; 6qc6b9 )ei fwqance Aaptinium decays via alpha-emission into Phfi6)6nr6 (9e2fl;wqvkq bv ycysicsbowlium. The decay constant for this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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