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

1#

94.24: A sample of radioactive 5nn:0t 535rtkxoctfematerial has an initial activity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 counts/min5r5knt:eo n x3c5 0fttute. 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 4.0 hours. Aj otj-ey/e x:l.+ xj8gpproximately how much of the radioactive element will remain t+ 8-jo lj:xe.e g/xjyafter 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 u/x /hh1( 1c6h-4bkkv08bqmhqiok zlfnstable isotope. After 20 minutes, only 1/16 of them have not decayeh8(/h-qlzcbh mk1xobq h 0 4ik6v/1k fd. 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 wouf7 8obl9/szpn gc;7huld estimate the sample's half life to be ablb;7ofgs/ nzh7p89c uout

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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 ir/o ++;x/l*l9w3oahp9ctqm1w om toto treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentage left after/+ 9lmh1 oq+* lo9it;/camxo3wwo r tp 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 radioactive decay y ny7y0ilut25 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. Approximarl wrr mg;u5le,; v2j+tely how much time must pass so that only 1/3 of the origimv5rl;l 2+;e ru,r wgjnal 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 ga8hq4 u0; 6 l+x5aldtyg bqx8kms has a half-life of 100 seconds. If there are initially 10000 of these gas molecules in a closed containert4a+0u 8 xybxqghdl ;86qkl5 m, 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 Aaptiniue 7wq8 b:t8(yb8wd samm decays via alpha-emission into Physicsbowlium. The decay con(se8 tbbq:8ad m 7yww8stant 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 de g/md9ad v8 8lve3g.5trdku x7cays via alpha-emission into Physicsbowlium. The decay constant for this alpha-emitgmr a.9 eddl uvdvgx78k853/ssion 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xxxxxxxxxx，获取更多资料
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