Half-life and decay constant - 无忧得胜-网上国际课程 (5edu.win)

1#

94.24: A sample of radioactive material has an initial activi y j pgkoeudu.xixk(8 +u/t+ *m9b-du2ty of 10,000 counts/minute. 30 minutes later, its activity is 2,500 counts/minute. The half-life( 9ti. dk/xg2kuoupu +mdy*j+u8 xe-b 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 how muc50xi kjah8t,m h of the radioactive element will remain after 120hiax 58,ktmj .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 minutes, ol b.mge(new3/ w/v 6aqnly 1/16 of them have not decayed. What isegn3wv/ (.qlewm/ a6b 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 radioacti; qx0zlj v0w7.psgoe 3m ld2-eve isotope decays in 4 hours, we would estimat3vwjep2x eml.l ;0s0d qzgo7- e 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 rays and fob nfp)1 scxcx ;g;3.is used in hospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentage left after 19 days will b xox;bffpcc1s;3.ng) e 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 devt5e5g5(( ptz em ztm ,39pvlycay 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 wiffu2hd2::zynl2jw gj4s66 ,bp eqbl 1th a half-life of 2.0 yr. Approximately how much time must pass so that only 1/3 of the original sample r4sz6lp:2gq2u f jbj1,2yfb n del6w h:emains?

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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-li de yx-4v3o:cbfe of 100 seconds. If there are initially 10000 of these gas molecules in a closed container, approximately how many of the molecules remain after a time of 250 seconds elapses?bce3x oy4-:dv

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A hypothetical radioactii(adu .7lejh(hk( y i**v: sfwve substance Aaptinium decays via alpha-emission into Physicsbowliu v(.:(di*hi*7esyauhj f lw (km. The decay constant 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 alpha-emi8:w ; lybn.cyiua-k9:skd scsmx+/ g5ssion into Physicsbowlium. The decay constant f-c5l+y8nk dxa9gsk:wimuc; s . /:sbyor this alpha-emission is 20 $s^{-1}$.
12.42 What is the half-life of Aaptinium?

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