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

1#

94.24: A sample of radioactive material has an initial activitym 2x4k /z ,th.wk.vzrqkn /+va of 10,000 counts/minute. 30 minutes later, its activity is 2,500 counts/minute. The half-life of k+rq.twn4 zxvaz km//,. kvh2 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. Appro 8yqn fww,)bw-ximately how much of the radioactive element will remain after 12.0 w,byqn ww8-)fhours?

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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 atomp d8:4m lfrrd4z xzov80,4mhks of an unstable isotope. After 20 minutes, only 1/16 of them have not decayed. What is the half life of 4l0, d vp mor:8 4hf8mk4xzzdrthe 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 radiorh.lbna*7x 2flp9b. l oht (u6active isotope decays in 4 hours, we would estimate the sample's haa h7.9thbn blflpx.ul(26o * rlf 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 rwab)zo)hl h4 khr)f 8;ays and is used in hospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentage left after 19 days hh)o a4)b8;)rhklzwfwill 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 radiopaqzmof2.(rw23ql ( 51 8fryd btxh5iactive 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 sa04x*6 fig 7usc4xjgsm mple decays with a half-life of 2.0 yr. Approximately how much time must pass so that only 1/37 sgx0*gmj6csx if44u 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 halfh8e (jhz.1 cxlf83k rd-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 25jrhc zh8(f 3lex1 d.k80 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 Aaptin02 cpt 4j(aqq / sz(m50kvbtjbium decays via alpha-emission into Physicsbowlipqctvzt4j( b/jbma25 k qs 0(0um. The decay 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 decays via alpha-emissi7(z uhmoyt)z pd 3**seon into Physicsbowlium. The decay constant for this alpmzzpu)soe73h*d (y * tha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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