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

1#

94.24: A sample of radiqjwxgo65wf:esi 31. h oactive material has an initial activity of 10,000 counts/minutexw1q3:w.hg5s jf eo i6. 30 minutes later, its activity is 2,500 counts/minute. The half-life of the material is:

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2#

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95.22: A radioactive element has a half-life ofuiv4q 8u;ek*hyugf 50 4.0 hours. Approximately how much of the radioactive element will remain u*58g0yi vuqkuf ;4heafter 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 unstable isotope. After 20 q8u nz9jy6do2qy 8fo /minutes, only 1/16 of them have nudq nzf9y86q/ o2 8joyot 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 i olrq1ap 9 xz,xt27s:rsotope decays in 4 hours, we would estimate the sample's hal: lxr9qxp2sota7z 1r,f 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 hospitistwsx.-4 s,biirb) /tcu,x+als to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentage left after iscts,w,+b-/.ri) u4i bstx x 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 r95np t+k ypxpyxci9ri tpmqnq240 8, .adioactive 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 decays wit zhh8)rdvn6r.h a half-life of 2.0 yr. Approximately how much time must pass so tz dhn hrv6.)r8hat only 1/3 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 gas has a half-life of 100 i um(d2 ;ihtl/seconds. If there are initially 10000 of these gas molecules in a closed contl 2iudht m;i(/ainer, 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 alpha-emission in oy:gkopy 9p*o) k):orto Physicsbowlium. The decay constant for this alphaypg:yko:o)k*o)r9o p-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 Aapti/ 3dmv5aml kfv oqf3-net p743nium decays via alpha-emission into Physicsbowlium. The d74o akf3vvm e3 qmt3dfln/ -5pecay constant for this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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