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习题练习:Half-life and decay constant



 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 actv,xduvy5 -i8n d:-f wuivity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 counts/minuwivv: d u,-df-x5ny u8te. 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 half1q, op4c9vps 9ly: iy;zri8g o-life of 4.0 hours. Approximately how much of the radioactive element will rqgpyoc,;1i 9 l9ysp 4ri8 o:vzemain 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 isoto kx0sdxn:2 5jcpe. After 20 minutes, only 1/16 of them have j0s ckxx2 n:d5not 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 ra,,n 8s1qnhlwm dioactive isotope decays in 4 hours, we would estimate nnhmw ,s,l1 q8the 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 andx*yshc*7)s.bz tsgkaypv2:;: x 4bon is used in hospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure san. xkpsb az ;b:4c tg):y2s7vyh*o sx*mple 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 decay with t6xxwi xon,:zft sc6 j.9 ju8x6ime 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-a4j( azvlg/j:c ow:b +life of 2.0 yr. Approximately how much time must pass sawzj/: v4( :la cg+bojo 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. I tvun5xp14cqdfi.0:x f there are initially 10000 of these gas molecules in a clo ifx40p q:vcxut1n5.dsed 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 via alpha-emission i.4nv )r 1 mc wrbjw,r7r6zc/emnto Physicsbowlium. T n, m7c4.rew)mr6zr/w rc1vjb he 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 radioactg gw0xr,bdbv/,zm84w ive substance Aaptinium decays via alpha-emission into Phyrm,/ zg8 d,wwb4bgx0 vsicsbowlium. The decay constant for this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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