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

1#

94.24: A sample of radioactive material has an initias e/,p72l 8nhhpfm:ss l activity of 10,000 counts/min2 p sf78e ,pnhl:shm/sute. 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 hap:(y yz9iu 0n hd+ xfc+k /bwy,t3m)zhs a half-life of 4.0 hours. Approximately how much of the radioactive elec9,0+ u:yfhkdt+/z pwyyz( nb3xmhi)ment 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 zd cn(p3 :r)tc*hqfp2 isotope. After 20 minutes, only 1/16 of them have not decayed. What is )n*:phcpzqrc2t (3d f 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 isots7;v*o tf w4btope decays in 4 hours, we would estimatwtb*s;oft v 47e the 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 hospitals to treat d w: sxsba3hjps4:n 95t47eae cancer. Its half-life is about 3.8 days. Starting with a pure samp w4na ds3a7hp:ss e5j9be 4:txle 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 radio.3idf b y*.lxnactive 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. Approxiuzkcb1clvaa1m) wsw7) c+( v7+ xcy-gmately how much ta)k) cca+c7 vwyuz+1m 1s -vc(xl 7wgbime 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-life of 100 seconds. If therewig xoyu c8)ot:a8t46 are initially 10000 of these gas molecules in a closed container, approximately how many of the molecules remain after a :x8) taycwitu846go o 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-emission1*clmsr0l nzr-m8qscf */6ccp* h;q x into Physicsbowlium. The decay0qs1/qxzccr p-; snf*l*m hc*crm l68 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 radioa:1szshtj( lrdzjr8t8 en( 75rctive substance Aaptinium decays via alpha-emission into Physicsbowlium. The decay constant for this alph sjrdrz:t sn(jhl1( 788trz 5ea-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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