 #1
amazingphysics2255
 60
 4
 Homework Statement:

Yttrium 90 is also radioactive and is a beta particle emitter with a halflife of 2.67 days.
Discuss the amount of Yttrium that would be present in the above example after the
Strontium had been decaying for the first 8 days.
 Relevant Equations:
 N/a
I believe I use a formula such as $$n\frac{t}{T}$$ but am unsure I've never done one without a given amount of the sample
So if I was to use this I would get 8/(divided by)2.67 = 2.99625468 rounded to either 3 or 2.997 But i don't think this is write because you need to use 1/2 in this formula.
edit: So 8/2.67 is going to equal the number of halflives has gone by so 2.997 halflives have gone by
(1/2)^2.997= 0.125 rounded so is the answer 0.125g?
So if I was to use this I would get 8/(divided by)2.67 = 2.99625468 rounded to either 3 or 2.997 But i don't think this is write because you need to use 1/2 in this formula.
edit: So 8/2.67 is going to equal the number of halflives has gone by so 2.997 halflives have gone by
(1/2)^2.997= 0.125 rounded so is the answer 0.125g?
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