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

1#

94.24: A sample of radioactive material has an initial actijnriy7j h6e-0yar - d+vity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 co7n deyayjrih6-j0r +-unts/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. Approw239:g:kf1q cu xjrv yximately how much of the radioactive1r jwxq3gu9:kf2 c:yv 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 unstable isotope. After 20 min:,n7doj.lim r 0kr,dqmbl 5-tutes, only 1/16 of them havetimk,n j.o,rld:7b05r-d lqm 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 cqw8o,fm r6:h ; p2eyaisotope decays in 4 hours, we would estimate the sample's half life to be aboutmcp, qe;ay8w2hf6 r: o

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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 hospita qur8lg)s,x:mt5n )no*rd tqm45wd.hls to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentage left after sn w5)mmg:4x oqd l*nuq. 8 ,5)hdtrrt19 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 radioact()yq yr07te3vxuir6e* wgl (cive 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 with a half-life of 2.0 yr. Approxim c ggx4f5m96mwately how much time5x9c6w4gf g mm must pass so that 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*qz 8tqmzlbsr6 n /z2.da i3m/ 8wqo5cnea k-9 of 100 seconds. If there are initially 10000 of these gmlneam*5 a23k .qzr//sbd8 6q wt8 zz-iq9co nas 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 radio 2xwwte5i * vos+61xgcactive substance Aaptinium decays via alpha-emission into Physicsbowlium. The decay constant for this alpha-emissio1tox2 5vi*wc+s6x gewn 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 radioactivuf ,+x lyw;+ixe substance Aaptinium decays via alpha-emission into Physicsbowlium. The decay constant foxw++ ,;uyxflir this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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