Half-life and decay constant - 无忧得胜-网上国际课程 (5edu.win)

1#

94.24: A sample of radioactive material has an initial activity of 10,000 c( kv91ut1u uvkounts/minute. 30 minutes later, its activity is 2,500 cov1tk k(1 uuuv9unts/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 5ti()b8ia o3- sdfq irelement has a half-life of 4.0 hours. Approximately how much of the radioactive elemi8ia)o(rb 3f5 i qdt-sent 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 at+dr+hs . bhz -guuqu4y;jpu(7oms of an unstable isotope. After 20 minutes, only 1/16 of them have not decayed. Whath7 .p4 ujgr++s ;bquuu- d(yhz 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 hoursi 4u;sq/zt3gr , we would estimu;gqszir34t /ate 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 canf 5n6amgig) s9cer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentage left after 1sn)m 9a5g6 gif9 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 t.v7o s36v vnng9;euyotl*ms c+ 5rat-ime 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 nagbb 4 e( pt: f+*v2pskse-x.of 2.0 yr. Approximately how much time must pass so that only 1/3pa-4pf: t2nv*ks sb+ e.x( bge 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 vh6jd -4)fxt 4nftx9t 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 af-9xf4txhtfv ) 6n4dtj ter 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 a2)tw9 v;(thyihfo :tfu fm93 substance Aaptinium decays via alpha-emission into Physicsbowlium. The decay aif9hftt 23u:yw;t o)mh9fv( constant for this alpha-emission is 20 $s^{-1}$.
12.41: Which one of the following statements correctly compares Physicsbowlium to Aaptinium?

A. Physicsbowlium has 4 fewer protons and 2 fewer neutrons than Aaptinium.

B. Physicsbowlium has 4 fewer neutrons and 2 fewer protons than Aaptinium.

C. Physicsbowlium has 2 fewer protons and 2 fewer neutrons than Aaptinium.

D. Physicsbowlium has 4 fewer protons than, and the same number of neutrons as, Aaptinium.

E. Physicsbowlium has 2 fewer protons than, and the same number of neutrons as, Aaptinium.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A hypothetical radioacg3t hniv-;4bxy5i-fb mw : 7dative substance Aaptinium decays via alpha-emission into Physicsbowlium. The decay constant for this afbdnyb7t ; x- w-mg5 a3iiv4h:lpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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