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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 activi .e*e6/vfux/aex(xaif x0z( bty of 10,000 counts/minute. 30 minutes later, its activity is 2,500 countf0i/b( axz*x e./ve6efa (uxxs/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. Apppgv9 ;rsqvetqv. 7w;.vny2(troximately how much of the radioactive element w vvvy.qstnvt qer. 9pw(27;g; ill 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 unstab2zhn+)kfi cm8), i76wst-j iyde8dxpev56gj le isotope. After 20 minutes, only 1/16 of them have not decayed. What is the half life o8idn2m ii 7xps),f ct-+jwzv)86 ge yed6j5khf 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 ho 2g2 bf)9px0uc qisa-kx- qwe8urs, we would estim-8x biu )keqcxsqwa-p2f9g20ate the 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 and is used in hospitals to treat cancqj nrk)e93:pj er. Its half-life is about 3.8 days. Starting with a pure sample of radon, the nepk9 j3):rqj 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 undergoey j)fsbh 9p:m 4-/kogus 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 of 2.0cw+qlj cm0gt3uf i: z)z(fi )- yr. Approximately how much time must3 0 +fitulf:iq(zw-))jgmz cc 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-limrb f(m(zf br8 phz1u 5a0ns9.hc1 p*ntng11c fe 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 elapses? *5zch 0pgs1rm 11uz ft h.nmabn8rb(9(pcfn 1

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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-emissiooqgst4 71i/-hchyn m-n into Physicny/h 4h-si 7 to-qmc1gsbowlium. The 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 radioactive s60; zl 4pxbfa8p2abrsubstance Aaptinium decays via alpha-emission into Physabx 4plp2sfz; a 06rb8icsbowlium. The decay constant for this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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