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Half Life
Quiz 1
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Q.1
The half-life of strontium-isyears. How much strontium-was originally present if 0.g is present in a sample afteryears?
4.0 g
2.0 g
0.13 g
0.25 g
Q.2
A bone sample contains only 1/4 of its original radioactive Ccontent. How old is the bone sample?
1 C14 half-life
2 C14 half-lives
3 C14 half-lives
4 C14 half-lives
Q.3
Why does alpha decay occur?
The nucleus is too large to be stable
The proton to neutron ratio is unstable
The nucleus is in an excited state. This usually follows other types of decay.
The isotope has too many high energy electrons
The nucleus is too small to be viable by itself
Q.4
Iodine-has a half life of 8.days. What fraction of a sample of Iodine-is left unchanged after 16.days?
1/2
1/4
1/8
1/16
Q.5
When is the rate of radioactive decay the fastest?
end
beginning
middle
Q.6
When radioactive particles get on objects. They are....
contaminated
irradiated
dead
isotopes
Q.7
Earth elements decay and change into another element in a process called_____________.
radiation
isotope
radioactive decay
half-life
Q.8
_________________ is when two smaller atoms combine to form a larger more stable atom
fission
fusion
Q.9
Complete the nuclear reaction85209At = ___ + 24He
83205Bi
86209Rn
81207Tl
85208At
Q.10
What is the relative charge of an alpha particle?
-1
0
1
2
Q.11
The half life of iodine-is 8.days. What percentage of an iodine-sample will remain after 40.days?
312.5%
31.25%
.3125%
3.125%
Q.12
Barium-has a half-life of 2 minutes. A fresh sample weighingg was obtained. If it takesminutes to set up an experiment using barium-how much barium-will be left when the experiment begins?
0.25g
2.5g
25g
80g
Q.13
Which type of radiation penetrates paper and skin, but can be stopped by a thin sheet of metal?
Alpha
Beta
Gamma
Q.14
In beta decay a ______ is emitted from the nucleus
Neutron
Electron
Proton
Wave
Q.15
Which type of radiation is used by smoke detectors?
Alpha
Beta
Gamma
Neutron
Q.16
What is the only difference between two different isotopes of the same element?
Number of neutrons
Number of protons
Number of electrons
Size of atom
Q.17
When an element loses protons, its __________changes.
protonic number
electronic number
neutronic number
atomic number
Q.18
Fermium-has a half-life of 0.seconds. A radioactive sample is considered to be completely decayed afterhalf-lives. How much time will elapse for this sample to be considered gone?
0.334 seconds
3.34 seconds
1.77 seconds
13.4 seconds
Q.19
Radioactive carbon-is often useful in determining the absolute age of geologic samples because radioactive isotopes
decay at a regular rate
become less stable during decay
remain unchanged over time
stabilize after four half-lives
Q.20
How many half-live will Ca-go through inms?
1
3
6
9
0 h : 0 m : 1 s
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