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

1#

94.24: A sample of radioactive material has an initial activity of 10,000as67smy :cixvuqfdb/4. e-p * counts/minute. 30 minutes ladc7b:/.x vyuefps qims 6*4 -ater, 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 halfowj/9vqj 4:c3b+wqj y-life of 4.0 hours. Approximately how much of the radioactive element will rew4v 3q/by9j:o jjq+c wmain 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 ,1a xloir )sw6minutes, only 1r1i6o,sw )l ax/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 isotopehr+ i(.trki*x decays in 4 hours, we would estimate thi+i rr( .kt*xhe 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 hospithrx3 c;i i2oy6a,fxy.xv, 2w8hpq3w ials to treat cancer. Its half-life is about 3.8 days. Starting with a pure saiiv2.w,cw3 ; fxpqhxa,ixo2 h3r6y8ymple 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 undergoes radioacs +qpnos6-sj *4r sim6tive 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 2.0or4d zzvg oqgz2vz5+t2az.dg l 8m380 yr. Approximately how much time must pass so thg52vor gz80dvzmt8 z2z+q oa4.dzg 3lat 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 s/mn5jzkuu;:gmh5a m 5ample of gas has a half-life of 100 seconds. If there are initially 10000 of these gas molecules in a closed container, approximately how many of the molecules rekm5h/za mjm;u n 5g:5umain 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-emission into P5b5hz*6pvow-b aaoh 5w ec1-ckyp)a3hao-3aec yhc-6 k 5*o b1apwpbw v5)5hzysicsbowlium. 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 radioarcgp r++v,oc+ctive substance Aaptinium decays via alpha-emission into Physicsbowlium. The decay constant for this alph cv,rp+o rgc++a-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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