amount left = a (.5)^(t/14.9) , where a is the initial amount, and t is the time in hours
a) sub in t = 48
amount left = a(.5)(48/14.9) = .1072a
= appr 10.72% of what you started with
b) can't be answered since you did not say what they started with.
set 1 = a(.5)^(t/14.9) , (once you know a, you will have to use logs)
The radioactive isotope sodium-24 is used as a tracer to measure the rate of flow in an artery or vein. The half life of sodium-24 is 14.9 hours.Suppose that a hospital buys a sample of sodium-24
a. how much of the sample will remain AFTER 48 Hours?
b. How long will it be until one gram remains
1 answer
1 answer