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

1#

94.24: A sample of radioactive material has an initialr op lx(s g/ijw)j 6/1yky-3cc activity of 10,000 counts/minute. 30 minutes later, its activity /)y-1 s 6kw3jrg/cyxcj ( ilpois 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 has o /)eu870m)dz/ ;tnx o fflhxpa half-life of 4.0 hours. Approximately how much of the radioactive element will remain after 12.0 hour7fxu mz8; eod)nl x)thfo/0/ps?

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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 are5gob0- xwgp3u7 caxv; N atoms of an unstable isotope. After 20 minutes, only ;ow3g5 xx7 c vau-0bpg1/16 of them have 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 isoik 6mphy.w j25y0beik/(z2ve)vks c-tope decays in 4 hours, we would estimate thmyekvszbj/i.0vic(yk6ew) h5k 2 - p2e 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 htr o;hd wtksr85ftm6zrt 61krj/84l - ospitals to treat cancer. Its half-life is about 3.8 days. Starting witj r4tk /d6 rr8stlo 1zw5-h ;8k6mrftth 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 radioactive decay with time constant 1, 5g2bxxzbucu p;6tk $\tau$. 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 7 upyex myw:qz9,q2 2isample decays with a half-life of 2.0 yr. Approximately how much time must pass so that only 1/3 of iu w,pem:zq y72qy 9x2the 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-lifes6hq1r *b id42 3rlbof 5exnpg;9o5pf of 100 seconds. If there are initially 10000 of thexp3r5 94l bfop;b h2if rqge5dn 1os6*se gas molecules in a closed 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 radioactive substance Aaptinium decays via aameo9i l7 +)lylpha-emission into Physicsbowlium+9l)7 yla eoim. 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-emission2y;t f7 t:2ls4*ot(bk f fnwyg into Physicsbowlium. The decay consbyytls2 f 4(o2n;g kft*t:fw7tant for this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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