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

1#

94.24: A sample of radioactive material has an initiw ,e7/4uvxjkl.cz kdx7 ed,5 qal activity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 counts/minute. The half-life of the ma5,7/.z,k 7kw4dxl cujeexqdvterial 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 radioactive2d cu7bvb3t)v49 ddc pi5t6ai element has a half-life of 4.0 hours. Approximately how much otdut32v65ac dvib)cp79 4i bdf 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 k2u8v,ht ;mn2sz fgb9jz8os 7of an unstable isotope. After 20 minutes, only 1/16 of them ha,g8j hutv2nks9o7z8sbfm 2z;ve 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 isotope decays i1m qmdq6q30+i44 jv-wkvjr3lm4z enrn 4 hours, we would estimate the sample's halrl- m+v1w4vd 6qznq4kij3 rqm4 0 e3mjf 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 hospitals to te(b srd5be* e4 q64bcxps ed82reat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, eexdc q (e 2*s8 r6b5dp44besbthe 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 undergo0y; o:5n sk8bfmf;h9cv db;zwes 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 hal 0;ty*frw k ,wpw4ajr)g5c(htlw5 /nmf-life of 2.0 yr. Approximately how much time must pass so that only 1/3cn0 tay 5h,rwfm5;w*rt /gpl)4k(j ww 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 seconds. If th,xe,mo2 nwh. jere are initially 10000 of these gas molecules in a closedx2ne o,mw j,h. container, 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 radioanb2 tpk qq0x9jq(fq2- ctive substance Aaptinium decays via alpha-emission into Physicsbowlium. The djtnf -qkqxq( 09qpb22ecay 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 radioactive substance Aaptinium deg lcgo18rtu6u+ v)s m*cays via alpha-emission into Physicsbowlium. The decay consu rvt18 6)csg omugl*+tant for this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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