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 inf 7oa 49l6cmu4xo8 gupitial activity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 counts/minute. The half-life of the materia mgo46 oal4xuf7u 9c8pl 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 qj/k;d8s2 cfrelement has a half-life of 4.0 hours. Approximately how much of the radioactive element will remain after 12.0q 2c8/kr;fsjd 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 unstable isotouj)(y04*m 13ihlo :vmpecy qzpe. After 20 minutes, only 1/16 of them have not decayed. What is the half life *mm1c(: 4)euqj l3ypizvyh o0of 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 isotopia3h(fun co pe 466(cfe decays in 4 hours, we would estimate the sample's half life to be abo fu 6i4onc 36ca((ehfput

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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 ft3 ;8e9 5k5kjrroaac is used in hospitals to treat cancer. Its half-life is about 3.8 days. Startinrcaakorj98kf ;35 5e tg 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 undergoes0ivk4gj2 /hc w 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 2.0 yr. Approximatel4 ae1,+ o1hqzr+mxdajy how much time must pass so that only 1/3 of thej+mdz4,1o 1r axaqh +e 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 jtzok*6 7xxt(half-life of 100 seconds. If there are initially 10000 of these gas molecules in a closed contakt(x6zo j *7txiner, 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-emissiob 3fva3 3xcd3hn into Physicsbowlium. The decay constant for thx3haf 3d 3cb3vis 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 Aapg12yxyet (tkszisgc )pk0 (v 8j8u:, btinium decays via alpha-emission into Physic)yivbsy(2kttxs,kujc g8 pg z8(0:1e sbowlium. The decay constant for this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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