Q.1.
The half-life of strontium-isyears. How much strontium-was originally present if 0.g is present in a sample afteryears?
Q.2.
A bone sample contains only 1/4 of its original radioactive Ccontent. How old is the bone sample?
Q.3.
Why does alpha decay occur?
Q.4.
Iodine-has a half life of 8.days. What fraction of a sample of Iodine-is left unchanged after 16.days?
Q.5.
When is the rate of radioactive decay the fastest?
Q.6.
When radioactive particles get on objects. They are....
Q.7.
Earth elements decay and change into another element in a process called_____________.
Q.8.
_________________ is when two smaller atoms combine to form a larger more stable atom
Q.9.
Complete the nuclear reaction85209At = ___ + 24He
Q.10.
What is the relative charge of an alpha particle?
Q.11.
The half life of iodine-is 8.days. What percentage of an iodine-sample will remain after 40.days?
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?
Q.13.
Which type of radiation penetrates paper and skin, but can be stopped by a thin sheet of metal?
Q.14.
In beta decay a ______ is emitted from the nucleus
Q.15.
Which type of radiation is used by smoke detectors?
Q.16.
What is the only difference between two different isotopes of the same element?
Q.17.
When an element loses protons, its __________changes.
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?
Q.19.
Radioactive carbon-is often useful in determining the absolute age of geologic samples because radioactive isotopes
Q.20.
How many half-live will Ca-go through inms?