7.5 activity and half – life Flashcards
1
Q
What is the half-life of a radioactive isotope?
A
It is the average time it takes for the number of nuclei in the isotope in a sample to half
2
Q
What happens to the count rate of a Geiger counter was by radioactive source
A
It decreases as the activity of the source decreases
3
Q
What happens to the number of atoms in a radioactive isotope every half life?
A
In every half life, the number of atoms in a radioactive isotope and they can’t rate both decrease
4
Q
What is activity?
A
The number of unstable atoms that decay per second in a radioactive source
5
Q
What is count rate?
A
The number of accounts per second detected by a Geiger counter
6
Q
What is half-life?
A
The average time taken for the number of nuclear in the isotope to halve in a sample
