The half-life of radium-226 is 1590 years. if a sample contains 500 mg, how many mg will remain after 4000 years?

87.43 mg

Step-by-step explanation:

Let the decay rate of Radium-226 is r% annually.

So, we can write the equation of decay as ....... (1) where, x is final amount after decay of t years and P is initial amount of radium-226.

Hence,

⇒

⇒

Now, we have to calculate the remaining amount of Radium-226 after 4000 years if the initial amount is 500 mg.

So, we can write mg. (Answer)

answer: your correct answer is b. d.

step-by-step explanation: