An alpha source in a smoke detector should have a _____ half-life. Half Life
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Which type of radiation is used by smoke detectors?
Why does alpha decay cause an atom to become a different element?
Describe the structure of an alpha particle.
What is the relative charge of an alpha particle?
In alpha decay, the mass number...
In alpha decay, the atomic number...
Why does alpha decay occur?
A radioactive source has an activity of 800 Bq. It has a half-life of 4 hours. Calculate its activity after 24 hours.
The activity of a source is 680 Bq. After one full day its activity is has fallen to 85 Bq. Calculate its half-life.
The mass number of Neptunium (Np) is _____.
The atomic number of Neptunium (Np) is _____.
The atomic number of Actinium (Ac) is _____.
You have 100 grams of radioactive C-14. The half-life of C-14 is 5730 years. How many grams are left after 1 half-life?
The half-life of Zn-71 is 2.4 minutes. If you had 100. g to start, how many grams would you have left after 7.2 minutes has elapsed?
If one-fourth of the carbon-14 is remaining then how many half-lives have passed?
Why do some elements have half-lives?
The diagram shows 32 atoms.16 of the Red are parent isotopes16 of the Green are daughter isotopesHow many half-lives have occurred?
The diagram shows 32 atoms32 of the Red are the parent isotope 0 of the atoms are daughter isotopes How many half-lives have occurred?
Gamma rays have
A radioactive substance has a half-life of 30 minutes.What fraction of the atoms will not have decayed after 1 hour?