Question

Iodine-125 has a half-life of about 60 days. How many milligrams of a 500 mg sample will remain after 300 days?

0.6 mg
7.8125 mg
31.25 mg
15.625 mg

Answer 1

one half-life of I-125 is 60 days

how many half-lives is 300 days?

Answer 2

@UnkleRhaukus 5?

Answer 3

yeah so the amount of iodine, will halve 5 times

Answer 4

( ( ( ( (500 mg)/2 ) /2 )/2 )/2 ) /2
=500mg/(2^5)

Answer 5

C?

Answer 6

@UnkleRhaukus

Answer 7

what is 500/32?

Answer 8

Oh.. I was confused. :) So it would be D?

Answer 9

@UnkleRhaukus

Answer 10

maybe

Answer 11

Maybe? I'm putting that as my answer.