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samia
radioactivity
samia Leaving Cert Physics11

how do you to the questions on half -life (decays and what remains)


11 Comments
samia
samia
:cry:
queenminni
what part exactly are you stuck on?
samia
samia
i don't know how to find half-life of a substance and what decays
hamzanasir
you dont need to know that im pretty sure?
clark13
clark13
you can find the formulae in the tables book
clark13
clark13
you can find the formulae in the tables book
samia
samia
thanks but my teacher didnt showes any formulae
Bima
Bima
Shame that nuclear energy isn't given more emphasis on the curriculum. Wouldn't expect anything less from the SEC...........
Bima
Bima
Shame that nuclear energy isn't given more emphasis on the curriculum. Wouldn't expect anything less from the SEC...........
samia
samia
i am doing physcis and chemistry so we dont have to in too much detilas
Ethan O'Mahony
T1/2 = ln2/lambda where T1/2 is half-life and lambda is the decay constant. Also A = lambda x N where A is activity, lambda is the decay constant and N is the number of nuclei. To calculate the amount of a sample remaining after a certain amount of time use the formula 1/2^n where n is the number of half-lives. To calculate the amount that decayed you can use 1 - 1/2^n since its 1 minus the amount remaining. Hope this helps.
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