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

1#

94.24: A sample of radioactive material has2gf yu .:xwk0d-coxhz+*3 uq j an initial activity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 counts/minute. The g2+xdu0fzwchqou.-jk3yx:*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 hal o3/4l /vfmrsylan (c(f-life of 4.0 hours. Approximately how much ofl/n(o lvfas (yc4mr3/ 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 Neck j:z- ..fcrjl:vv;c ) ui3l atoms of an unstable isotope. After 20 minutes, only 1/16 of them have not decayed. Wl.:vc 3.i :-u vl)crfj zec;kjhat 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 ok. tocp d;7/my/zsmqmy9f 1j0f a radioactive isotope decays in 4 hours, we would estimate the sample's half life tcs ok/ ypz9m1 d/ym7;fq. tmj0o 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 it.cnr i x d0ow+ 4efc))*fn*cps used in hospitals to treat cancer. Its half-life is about 3.8 day* e))ow0nrnc+.ifc4* tfpc dxs. 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 n-,nb w nt3p--lxx d9pxxb(-i rdx iip(9c:g.radioactive 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. Approximately s(g zntc8e3 1yhow much time must pass so that only 1/3 gnsez3(1t c8y 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 gamy(,xt/ xpkd,i.3c an s 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 remain after a time of 250nxami dt,kx / ypc(.,3 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 Aaptinin/i/yp*0pm zo um decays via alpha-emission into Physicsbowlium. The decay constant for tnpz/o0imp y/* his 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 alpii /;r0x4eu. 2 amneqq()qi7 sax7vlqha-emission into Physicsbowlium. The decay constant for this alpha-emission is 2.ie a qx4xq0vin7 2mqqr);e( l i/7sua0 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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