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

1#

94.24: A sample of radioactive material has an initial activity of 10,000kgtv 5kaqpr. r; :rv)1 counts/minute. 30 minutes later, its activity is 2,500 counts/minute. The half-life of the mk:rg5 tk;) rrqv.pv 1aaterial 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+9 s b((nn(tpfjtmp e7 4.0 hours. Approximately how much of the radioactive element will remain after 12.0 (pp(mfte 9nnb 7tsj+( 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 isotope. After 20 mia( jolf2utvt;(5t1f1 ldc w5gmi:cw;nutes, only 1/16 of them have not decayed.w ftv(o2l5c j1iagm; : c tt;fu(5dl1w 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 in 4 hours, we woutm6gzamb,j*wzvyk)6 9 o 3q:lld estimatl)yb t*q:ajo gz6wm9mz kv3,6e 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 cancer.kw/vhm4z9sqf7.,pf.mhfi o,m y1s5m Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentagei .m,v917. qh fy/zfwm4msfm,po5s hk 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 consnpn1ey3e.9zj - upvn6co;oy w cj0o-0tant $\tau$. 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 hkok 8xut*/jg67ea x)k alf-life of 2.0 yr. Approximately how much time must pass so that only 1t kx)o 8gux /ke6kj*a7/3 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 gasknzastr47 7)6nby tt 9 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 rtyr97 4tsntkzn7b6 a) emain 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 alpha-8ol lzjz:uj6 d1*s f)hemission into Physicsbowlium. The decay constant for this a8j:l*df1jzlosh )z6u lpha-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-emission in fx/8r611dsaf (roze eto Physicsbowlium. The adferz/(f 8s1 1r6xoedecay constant for this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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