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

:cry:
what part exactly are you stuck on?
i don't know how to find half-life of a substance and what decays
you dont need to know that im pretty sure?
you can find the formulae in the tables book
you can find the formulae in the tables book
thanks but my teacher didnt showes any formulae
Bima
Shame that nuclear energy isn't given more emphasis on the curriculum. Wouldn't expect anything less from the SEC...........
Bima
Shame that nuclear energy isn't given more emphasis on the curriculum. Wouldn't expect anything less from the SEC...........
i am doing physcis and chemistry so we dont have to in too much detilas
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.