Half-life and decay constant - 无忧得胜-网上国际课程 (5edu.win)

1#

94.24: A sample of radio30yhwd+dp n5: s f.sgoactive material has an initial activity of 10,000 counts/minute. 30 minutes o3 dsw0: d fnphgs5y.+later, its activity is 2,500 counts/minute. The half-life of the material is:

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2#

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95.22: A radioactive element has a half-life of 4.0 hryb*)d ezowh9*a7 f8jours. Approximately how much of the radioactive el **7hj b8 wrdfzya)o9eement 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 i hy(fgbu es,;ixva 1,9sotope. After 20 minutes, only 1/16ev9ia s, gybhu(;x,1 f 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 decays in 4 hours, we w fs0ov qoh5q4z7lw;5c ould estimate the sample's half life to be abou7wqlso4q5fco50 h ;zv t

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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 hospb +ljh66j .rnvitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample o+ j. b66vhlrjnf 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 radioactiv zr/r3x g6 )h pqyt4a3vt3hqe*e 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 w (ge(cq )qvklflv33(dith a half-life of 2.0 yr. Approximately how much l qd fq((3lv3egckv()time must pass 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 7,jfrc3gh fu,:97lgj g df 57/ ww+l6fdnqdus-life of 100 seconds. If there are initially 10000 of these gas molecules in a u7 ld7fdswq f g5gd,hjfj63+r/lw9f c 7,ung: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 radioacti1.y7 d mv3jy4vqcb b8ge60p5 hnv.mfd ve substance Aaptinium decays via alpha-emission into Physics e .7y8m d0dng.cv4jfhy5 qvmv16bp3b bowlium. The decay constant for 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 Aaptinium decays viaubtjqv 6h4.ckj1v q .9 alpha-emission into Physicsbowlium. The decaykq.ub 6h4. j9j vq1vtc constant for this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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