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