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

1#

94.24: A sample of radioactive material has an initial activity of 10,000r xx8z*jh:,y 8p1o9atkai e1g counts/minute. 30 minutes later, its activity is 2,500 c:a1e xgjyo1xz t*p,k98hiar8 ounts/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-lifecak zhrch92,.5jm +)w3d*bc8qxvt d u of 4.0 hours. Approximately how much of the radioactive elemhcuq )cab,3hdc 89dvm2*.ktjwr z 5+xent 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 a*b2q pnk iuiq05c8t5hn unstable isotope. After 20 minutes, only 1/16 of them have nhqk5c i5qi0p t* 28unbot 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 isotope decays in 4 hour jq6p8yqj: h(wm 7fcx(s, we would estimawhq :y( 6pqxcf (jj7m8te 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 raysrkv0 +64jgjon 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 levj+rng6o4 0j kft 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 undergoeshr1p d3, zu0n46km.z r.oc rgj radioactive 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 sample decaysx0 x*mnrx2(p8fi:t u(vina)l with a half-life of 2.0 yr. Approximately how much time must pass so that only 1/3 of the or:x xiannf2l08u(xvt p * (rmi)iginal 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 of 100 sc.z6 -f 9l83gm8j1gqjs acbw veconds. If there are initially 10000 of these gas molecules in a closed container, approximately how many of the molecules remain afte cgj1 wbv3sm968cjq-8alz.fg r 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-emission i( /fbt niwpq:q )1fs+knto Physicsbowlium. The decay constant 1/+ :)fisq(nqt wkfbp 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 alphabs:-q *6s gjcq-emission into Physicsbowlium. The decay cobs *cgj6-qsq :nstant for this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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