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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 activity3w7wil lehhy3us-g6 +tap 7l*z 5r36h3v rryp of 10,000 counts/minute. 30 minutes later, ilhlyrgv+ 36 r6 7weu3y3 a7ltph*pw3r- s zhi5ts 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. Approsoyb 4r2k )os ,zvy5l/ximately how much of the radioactive element will reozb 4 5,s/k 2sr)yoyvlmain 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 ar js736h2qx uiwe N atoms of an unstable isotope. After 20 minutes, onlywsih6x2q j u73 1/16 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 decays in 4 hours, we would e /*y07kah y6kikk(v c 5ms(onzstimate the sample's halykyanh ( 5/(k ok*m0c 7vksiz6f 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 rayslltk;7yp 7sx 5 and is used in hospitals to treat cancer. Its half-life is about 3.8 dak lyxs75l7; ptys. Starting with a pure 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 undergo-ldq)jkz; 3p6p fo8aq 8zkk 57k .ltioes 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 half-life o q ;iydusakk5vfk-0/2f 2.0 yr. Approximately how much time must pass so th05 yis ;k k2fqkdv/u-aat 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 l8nn;)qm jhbs5q(f vebk6 1q1half-life of 100 seconds. If there are initially 10000 of these gas molecules in a closed container, approxin j f5)1mq6 bqlkhvnb8;q(es1mately 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.9jef fvw(/nx decays via alpha-emission into Physicsbowlium. The decay constanfx. / (nve9fwjt 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 decaj3-qekmee9*o zkbu d+lbh.c51 ir* 6p ys via alpha-emission into Physicsbowlium. The decay constant for this alpha-emission is 2i- l ue53q o6zj.1credb+ep*m h9*kbk0 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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