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

1#

94.24: A sample of radioactive material has an initial actic34: do fl7jjevity of 10,000 counts/minu4 d e73ojjlc:fte. 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 has a half-life of 4.0 hours. Approximately g(eg/r ka) (aeaw8nt+how much of et(n gr8(ea/+ga)akw the 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 unstab7synxoc yk4) ue7k w,7le isotope. After 20 minutes, only 1/16 of them have not decayed. What is the half life of the iso7c774uxsyko w )ny e,ktope?

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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 houyr; jm7 9n*aa s13c o/j/ardi76ahn ozrs, we would estimate the sample's half life to be*9h1on7 i no;a6j3 m/dasr z7yrc/aaj 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. It41rubqm33 wxut/ sqm/5;h 6rd+stwk ds half-life is about 3.8 days. Starting with amw46us /rtbq1w3kt+ 3m;q5ds dxh/ ru 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 constantqp8xgbjfabn99l3g4wva.me4 5 e9ni. $\tau$. 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.g a-7qp3(psur 0 yr. Approximately how much time must pass so that only 1/3 of the original a7 qg3ppsu-(rsample 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 ha9 : rerhy.(ho;; gboias a half-life of 100 seconds. If there are initially 10000 of th oh 9baehr:;(;iroy .gese 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 subst3ykye-si pef/68/yqs ance Aaptinium decays via alpha-emission into Physicsbowlium. The decay constant for this alpk/ ys 3eqypse/yf 8i6-ha-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 intoj6d1owh- 0nv6bz: iejt1aiyip j7 +0l Physicsbowlium. The decay constant -zwv1:jb+ 1 ii0y j e7opi0dlan 66tjhfor this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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