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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 activn4z9 z*xg+m2dymrm2jity of 10,000 counts/mi+zj2xzm gm*r4 y29mdnnute. 30 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.z7e2 l y)cjp0yi:4qix6+ c:(xmner i l Approximately how much of the radioactive element will remain after 12.0 hourxz ei2+i07cpx rn:jyq6y:lclm4e ) i(s?

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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 : u):izuoxhmq4bt 0, dan unstable isotope. After 20 minutes, only 1/16 of themz: b)q0udi,4 xm o:hut 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 decays in 4 qeme 7xhq2ov1n8 :yy2 hours, we would estimate the sample v 2yhqmo2ex7:nq18 ey'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 gammpq+8mw+/kzc z+q4 dhj a rays and is used in hospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentage left after 19 day jqhz+ m wqkdp4++c8/zs 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 de 0d2l 2utkjxsb:nq3v9 cay 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. Appr;vlv9.b .t/ wsra7tszoximately how much time must pass so that onl/. tb7wr9;av.z stsvly 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 gastigr lq.4idm/g g1 :.s09qubm has a half-life of 100 seconds. If there are initially 10000 of these gas molecules in a closed container, approximately how many of the molecules remain after a time of 250 seconds elap.:/bg1qutm 0m9ig. rg 4 dilsqses?

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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 viam)o bd6rlu/t - alpha-emission into Physicsbowlium. The dec-/rb m dtoul)6ay 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 Aaptinill 5agk*qf pdttet ;46yew:3 )um decays via alpha-emission into Physicsbowlium. The decay constant for this alpha-emission isd;:fq3ttl6 w45pe k*lya)tge 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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