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 ac+q .9d 3rdyqlgtivity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 courlq9y.+ d3g qdnts/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. Approximately 3b dsf)kk7augra9;cp h7 b x:/1bzx5r how much of the radioactive element wb9a7 kag c17)kuh;/rxzdp3 rxb bs :f5ill 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 thereml)f q-d(nvoo.h)rg/- iz f q+ are N atoms of an unstable isotope. After 20 minutes, only 1/16 of them have not decayed. What is the half life o-qd-n mlir )oz(/.qgof)h+fv f 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 sampluktys6e k,q(h du9fu yu58)3b e of a radioactive isotope decays in 4 hours, we would estimate the sample's half qysuuuh )kudy38 96tkf( eb 5,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 cancentcd 8jedfvw1*op*;.h ; e wn,r. Its half-life is about 3.8 days.j.;c 1o*wnpehd fwe;,nd8t*v 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 undergoes radioactive decay with time consthj;1o0mayi.y 3 ma fb,ant $\tau$. 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 20hqdhmzg7.x/vyw55 i 7b2d ax .0 yr. Approximately how much time must pass so that only 1/3 of thxmy /7gqibwd205 z. a5v h7dxhe 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 sa v(d0q2 j:mc+ya1wpu7vqo h 2jmple of gas has a half-life of 100 seconds. If there are initially 10000 of these gas mol+27mav q o(u jqy1dwcj v:2ph0ecules in a closed 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-e us id9*b4ojko9tm,:n mission into Physicsbowlium. The decay constant for this alpha-emi*bmd,4: tsu joniko99 ssion 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 radioactive substance Aaptinium decays via alpha-emx90n qecnjg63 v iz8j)ission into Physicsbowlium. The decay constant for this alpha-e3njq0 gc6izx8) jne9vmission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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