half life Flashcards
1
Q
whats the half life of a radioactive material
A
is the time taken for its activity to fall to half of its value
2
Q
what does each isotope have
A
they have a specific and constant half life
3
Q
whats the unit of radioactivity
A
the unit for radioactivity is the becquerel 1bq = 1 disintegration per second
4
Q
whats the charge, mass and distance travelled in air of alpha radiation
A
+2, 4, afew cm
5
Q
whats the charge, mass and distance travelled in air of beta
A
-1, 1/840, afew m
6
Q
whats the charge, mass and distance travelled in air of
A
0,0, afew km
