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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 materiag lezoh73 lrxvg88wxfg80 9 b2l has an initial activity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 counts/minute. The hagl h8ogb7lg3xwv0rz89f e2 8 xlf-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 howr(k jf u69y.ix much of 9uyixjr .(f6k 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 of an unstablesk,nn/zx 3sbbf)..g t /qy-hh isotope. After 20 minutes, only 1/16 of them have not decayed. What is the half life qs-s fh/.3nbbt kg)ny/ xzh., 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 radioacc nra -a z7lmd*1z:m:.w hip0mtive isotope decays in 4 hours, we would estimate the smar:*ld-h.0za7 1mpiz:mc nw ample'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 a0zukd 1f..1il eyps l*nd is used in hospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure.1isu ldf 1zpl*.0 yek sample of radon, the percentage 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 radioactive decy6rhg1ik2 do szi7a 8/ay 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 half-life of 2.0 yr. Appr7s r8a( w9bfa30axty qoximately how much time musa9w0b8atsy(q7r 3 xf at 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 of gas has a half-life of 100 seconds. If there are -tcoaps(+- ae,qo i, finitially 10000 of these gas molecules in a closed container, ap-,sqf po(eac it,o -a+proximately 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 Aapn 7lo8fpcmp fiu+r z8kk/-p+8tinium decays via alpha-emission into Physicsbowlium. The decay constant for this u p8o rnpimf78k/p+z8+-flc kalpha-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 su uup.taxvl*h-ow 8+z)bstance Aaptinium decays via alpha-emission into Physicsbowlium. The decay constant for t 8.v-oahu*wzp ltxu+)his alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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