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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 an initial activity of 10,00xst s :2:qe4 fs 1tw5) sg3y,ee9gxgey0 counts/minute. 30 minutes later, its activi3g1e:s eytx s2x5w:g)fey , 9sge4 sqtty 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 half1 du 5q9azetf 4)bbme 87yx,ae-life of 4.0 hours. Approximately how much of the radioactive element will remain aft )84, 7e f9baduat myqxzbee15er 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 ther9g f morxz5):ge are N atoms of an unstable isotope. After 20 minutes, only 1/16 of them have not decayed. What is the half life of the iso xg ofz:)rm59gtope?

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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 radioactiv-4c /cyg;u7 qowlw gp9e isotope decays in 4 hours, we would estimate the samplcy-/o;l ww7ugpc9 4gq e'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 treat canc,i go rj06kfi(qeq 5*rer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the rg r(56kifi*q, 0 qeojpercentage left 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 id0 qb/fhddv91nq /qk7g 4ap .radioactive 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 with a hr2ja x 6rm pz1j8f wu/,gkqa*+8kki9ialf-life of 2.0 yr. Approximately how much time must pass so that only 1ki/, wf1x9makpj6z8k uj8+r *gq2ria /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 of gas has a (p* 2k ot*c3jc-dral5ib uf;hhalf-life of 100 seconds. If there are initially 10000 of these gas molecules in a closed container,a*5oclip;3(ucf hdrbk 2*-tj 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 Aaptikxbqmkx ;3* n-2zp;-ndb+r fcnium decays via alpha-emission into Physicsbo2n *;;fzxq3kprc + -bdknxm-bwlium. 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 substance Aaptinium decays via alpha-emission *u u mm x2om* mq8:f.5a7pntbvinto Physicsbowlium. The decay constant for this alpha-emission is 8*5u fm*7mu2.xoam ptmb qn:v20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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