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

1#

94.24: A sample of radioactive material has an initial activity ofhw7 ryov91y k9 10,000 counts/minute. 30 minutes later, its ack7 o1y9hvwyr 9tivity 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 has a half-life of bxa//,wy28dtm/y ssl(r hpsz.q /* jx4.0 hours. Approximately how much of *x y//.2w(pxtrmdz8ahs / y l /jsqs,bthe 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 of an ufnom6w7k *jq nu* 2j(unstable isotope. After 20 minutes, only 1/16 of them have not dec* *6jnnuu(j7 o2mkwfqayed. 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 would 3bjpnzq +meu(/z+; xk estimate the samq3+uzx/ pebz+(j;nk m ple'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 ink/de/2;al m-s+cm bk p hospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample osm pe m-k;/d+l2k /bacf 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 timi++ bcxd p (qmue68ht,e 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 halft6 gp(k 1wuv3y x,wfn d,hut0--life of 2.0 yr. Approximately how much time must pass so that only 1/dg, 1-x,6wu y(v utt pkh0w3fn3 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 ofqpeb di h, 0tm)vua)4, 100 seconds. If there are initially 10000 of these gas molecules in a td h )u ib,0e,4vpmaq)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 /x( b) zume1ncvia alpha-emission into Physicsbowlium. The decay constant for this alpha-emission isu/c )emxzn1b ( 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 :hvisfi7 )zv3 substance Aaptinium decays via alpha-emission into Physicsbowlivi :hzsf vi)37um. The decay constant for this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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