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

1#

94.24: A sample of radioactive material has ani3 4)u egkm;f)2;7sfp 9x dbr nnl6zim,y+fdp initial activity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 count2) n3mi bdi+)z6 px,7mne;rfls9pf fdy 4; guks/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. Appr7x(; he2 vldbcmix2x/nf4 hs+oximately how much of the radioactive element will rvh(lxcdh7 x2n/;xfs4+b2m i e emain 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 ,n64zqh )hnfkare N atoms of an unstable isotope. After 20 minutes, only 1/16 6hkq) fn4h, nzof 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 gp519k 6r 5f poq ui22yvin/hyz81g kva radioactive isotope decays in 4 hours, we would estimate the sample's half life to be about1rp1g z92hq8v2yv p5kki / 5oynfgui6

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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 ho do(1 m-0+gaxs bek qfhp06;tespitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentabe sko- 0ap qmhf;16 td0ge(+xge 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 radioactive decay with time constant v 44x2aozr0nligl0 - r$\tau$. 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 oo v ))c+ojl*+j)zrat yxu2n c0f 2.0 yr. Approximately how much time must pass ouza+ +))tc0yjnr* cl2)xo v jso 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-life of 100 seconxu 7*c lqq e4zk6n5x7m0u qwin9d3 j*xvw 9hr3ds. If there are initially 10000 of these gas molecules in a closed container, approximately how many of the mole u 96qqnwnd5e*wu7vj7hq 4k9xrc 0*zxm3xl3icules 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 decays via alpyx) o.ard c01zail+g+ha-emission into Physicsbowlium. The decay constant for thisr1dc z . x++oy)ag0ali 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 alpha-emisvdehgae- o3*l l5)/arsion into Physicsbowlium. The decay constant for this alpha-emission is 2odl*laer 3v-h 5ga/e )0 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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