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

1#

94.24: A sample of radioact 9e;msk6y)p:ap hlx56np/xg6n 0bchiive material has an initial activity of 10,000 counts/minut6 a9py c)pp;lmh x keix/ g6b:0nh56nse. 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 half-life of 4.0 hours. y2 ff*87ryfqzsf.33k6 c wvyxte 6l3 rApproximately how muchkyf63 z6feqyst7c8ff r l3yvx. 32 wr* of the radioactive element 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. Afte5 sifmsvw u u4uj5:cn 2w*e:*pr 20 minutes, only 1/16 of them have not decayed. What is the half life of the 2pfwu 5 c:5is*4nm:*uj sv uweisotope?

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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 hour:b5 tz.gd/ety/ , cl89 uqej ooy.iz2:tc;blrs, we would estimate the sample's half life to be ab5lq2/d8jy9 ; ieletgbtu:c:o.,r t/z bzo.y cout

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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 to treat cancso+cs lcdo(8f ot:8 a;er. Its half-life is about 3a:d8of c(8o soc+;l ts.8 days. Starting with a pure sample 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 radioactivzz3qmw)w*2 l+ev uzu1e 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 2.0 yr. Approximatelr06ku ich /80ycxcp t3y how much timeyiu 30cc6t0crkh x8p/ 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-l0bbx5mlszl9 5a zz7z)ife of 100 seconds. If there are initially 10000 of these gas molecules in a closed container, approximately howzz b09bl 5ax5lsm)zz7 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 Aaptinium deca9 xeb,x4we9v:k g tv+nys via alpha-emission into Physicsbowlium. The decay constant eg9b k4nvex9t,:x+w vfor 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 via alpz,0 *k mac j4aqb)0uskha-emission into Physicsbowlium. The decay constant for this alpha-4s 0mqzk,kb caj)a*0 uemission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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