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 actuog *wxv8b ,; 75r7ukp b8sqfeivity of 10,000 counts/minu*87u7wf qsb bgo8v xe5;,kr pute. 30 minutes later, its activity is 2,500 counts/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 halfdgvr41tv1v mjh4 :a vrcilf+j /:8dem)q3kt0 -life of 4.0 hours. Approximately how much of the radioactive m :c j0 )/8ddv+tieh1vakr 3v1r4m 4 tgv:jqlfelement 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 of an unstable isotopkz+o3+-gzo fe /6j lwoe. After 20 minutes, onl6+kzw f3 ogooj+-ze/ly 1/16 of them have not decayed. 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 sample of a radioactive isotope decad d303d kws78+tjlwb oys in 4 hours, we would eswst3d7o3l8j0 dbw dk +timate 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 gammyu3tqn4n:w ;a a rays and is used in hospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentage left after 19 :4awtyu3; nqn 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 dep/4r:z)n9 u froc-yyp cay 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 s 9c;aa vg39nwtample decays with a half-life of 2.0 yr. Approximately how much time must pass so that only 1/3 of the originanc9 ;9 tg3awval 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-lieoou79mt-w9,k.ud kxfe of 100 seconds. If there are initially 10000 of these gas molecules in a closed container, app ,muo.-k997u tdwxoek roximately 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 radioact.e0q8i to i. lnvon; w,7wb(mgive substance Aaptinium decays via alpha-emission into Physicsbowlium. The decay constant for thit78wv,.imon ;o (w0ig nb. elqs 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 Aaptinium decays via alpha-e m:bu)pw .x 1.ld1+w jxogye3kmission into Physicsbowlium. The decay constant for thixlgo)1 uwxe.wd+p y3:mb .1jks 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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