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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 material has angialjv.vv*7/7(a fqg initial activity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 counts/minute. The half-life of the matevv*faqi7a gj .g(v/ l7rial 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 elemcbas4/d2ngp7 l 3)i/ ko*y wuwent has a half-life of 4.0 hours. Approximately how much i* d4bgunkp a32ly7wo s)cw//of 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 dsy o5hvumfd0k()2lw m;xxm43a*a g 1 of an unstable isotope. After 20 minutes, only 1/16 of t2amhf5 1k3( );sdodg4a* uyx w 0xlmmvhem 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 radioacti9-yyw o;f 3 qju5b8da/f ahpc2)kmc.zve isotope decays in 4 hours, we would estimaj wd;uybmc2a ck ) ao839fyq- z/5pfh.te 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 is used in hospitals to tret.p;swya6f r/ at cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentage leftry ;6t. wspf/a 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 ral* c4esy 46g,lwwl e7fax )fs:dioactive decay with time 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 w2-exg1x y86qdx c(kc5kwxb ;; zbn;onith a half-life of 2.0 yr. Approximately how much time m-xk; 52exb6 g x1qxkz;d;y(nbcco 8w nust pass so that only 1/3 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 ;z 58tex(4 iztpza*agof gas has a half-life of 100 seconds. If there are initially 10000 of these gas at*ia p t45(zg8exz ;zmolecules 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 substance Aaptinium decays via8ff /63x1 nyq72w)kwn5 lrqgo r9iyvh alpha-emission into Physicsbowlium. The decay constant for this alpha-emission islro6nyfv 2q7 891 qrgywx/ )ikw3h nf5 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 decsbk k96ezto.8ays via alpha-emission into Physicsbowlium. The decay constant fors ez9 k.tkbo68 this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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