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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 radi411icb tpw+b*xa d( - hjdxb;coactive material has an initial activity of 10,000 counts/minute. x +a xwcp;(dcbd-i14h b1*bt j30 minutes 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. Approximatel,/pmht v nbnky9f,a 8a*bf s+0y how much of tanhk 08b*v p9f/ fst,na+y b,mhe 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 unstable iss ,u)uoay)4z adls6xy -4h/ ihotope. After 20 minutes, only z-oyai)las u4ux, d h s/64h)y1/16 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 radioactive isotope djh,s*mgmw x98 ecays in 4 hours, we would estimate the sample's half lj*w,s m9hx8gmife 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 hgp:8jw0(jrbnk70r 9mj-d:w 2ew kltaospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radowbde mkrl0kj:-2an: w0 rpgj9j 8 (wt7n, 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 decay with time/ rc( pj26z hsq9ln.tz 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 s: b.drjl nq24592vhq jy(nksoample decays with a half-life of 2.0 yr. Approximately how muc jhvd.b5qsn2(:l yqk 2j r49onh time must 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.pd5xhz +iwo;. If there are initially 10000 of these gas molecules in a;hd5 .izpw+ox 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 decanob8/ 3aquz q*ys via alpha-emission into Physicsbowlium. The decay constant for this alpha-emissiono*3q/ 8uab znq 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 substabh7ujirk) 9e 1z7 x-a7hn5j fonce Aaptinium decays via alpha-emission into Physicsbowlium. The decay constant for this alpha-emi7 zij1 5reb)h nhu7a9-kox7 fjssion is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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