Half-life and decay constant - 题库网 (tiku.one)

1#

94.24: A sample of radioactive mar n;sb/ h80i5yffee7mterial has an initial activity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 s/5 0y hm8f;nebir e7fcounts/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 4.043fm/-99semxt8n /pzp 04iorwno n dl hours. Approximately how much of the radioactive eld /teop l9r m4 x0/-owsn nm8i4nzf93pement 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 isotope. After 20 minutes,a-ungg6 aq 1u: yv3le.7zz mvd *)tl9j only 1/16 of them have not decayed. What is the hlz uvezqglta .vg *j916a)ndy-:mu3 7alf 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 hours, we wodc,l ) ;1gj7 xdm+mbvruld estimate thegdv 1cb7d;xlm,j + )rm 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 a s43,+sy znxlf ty )oqse;09.eg9salhospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of razxaf.tye;nal 94 gy+30,s9qs so s) eldon, 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 radioact.jt30jclwv j .ive 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 2s mbsbt+m54d13 t eytsample decays with a half-life of 2.0 yr. Approximately how much time must pass so that only 1/3 of the origm2tbdsesy+m14 3t bt5 inal 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-lqf ; aq)gdhp9/ife of 100 seconds. If there are initiap/a ; 9dqqh)fglly 10000 of these gas molecules 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 Aapti*dxx: c)c.2unt0air v nium decays via alpha-emission into Physicsbowlium. The decay constant for this alpha-emixc2d t)n0i:xvrua*c .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-emisk4l /zs.s3lyw i3qi) jsion into Physicsbowlium. The decay constant for this alpha-emission iz. 3qwk) iy4jssi/ 3lls 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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