Question

The half-life of ¹³¹I is 8.04 days.

(a) Convert the half-life to seconds.

(b) Calculate the decay constant for this isotope.

(c) Convert 0.350 μCi to the SI unit the becquerel.

(d) Find the number of ¹³¹I nuclei necessary to produce a sample with an activity of 0.350 μCi.

(e) Suppose the activity of a certain ¹³¹I sample is 6.10 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity at the end of that period. (Enter your answer for the number of half-lives to at least one decimal place.)

	half-lives
	mCi

Answer 1

We know the emperical formulae for the decay constant, half life, activity of sample etc. So we just need to put the values and take care of the calculations.