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 initixsuc/qym l/bxl9j 61n )f46dsal activity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 counts/minute. The half-life of the matexj)cu /19mls4q b6ds6ynx/ lf rial 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 hourudd1 li ul8kj31. kec3s. Approximately how much of thej1ckd. l 31 k3lueidu8 radioactive element 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 atoms r ilxulqit)-) ki;u:8of an unstable isotope. After 20 minutes, only 1/16 of them have not dklu)i-r 8:)it u;lxq iecayed. 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 sa g2x sr97 *pqloz:-jprmple of a radioactive isotope decays in 4 hours, we would estimate the samplrsporz 7lx-j 9*pq2g: e'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 m iegnd0 ig0+;to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the nim+00 i;deggpercentage 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 undergokwlv,v5 5krh q)kkh;c3 8ve5broo (+ ces 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 d:r(ynel4qn 2oj.w1p+ v z0qp nlmv (12.0 yr. Approximately how much time must pasj1 py2vzro(nwn(dm e:+l1lq 0q4 vn.ps 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-life of g;2nt skxi7*xdex 5d-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 xx*tikeddgn2 -s7; x5elapses?

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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 alphhn7nh bu04xyh 9y.m4nhh6kw fx4:i4ma-emission into Physicsbowlium. The decay constant fn :x hh9fn0mxm4ui4y.n6 b74 k4hyhwhor 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 radioactive substance Aaptiniv* 4dx-njn5vs( ek /aqum decays via alpha-emission into Physicsbowlium. The decay constant for this alpha-emission is xn -qs45davek*/njv( 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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