Physics
posted by b .
Suppose you have 100 g of radioactive plutonium239 with a halflife of 24,000 years. How many grams will remain after (a) 12,000 years (b) 24,000 years (c) 96,000 years?

after 24000 yrs 50g will be left.......after 96000 yrz grams left will be 12.5 grams.....and they not decay after 12000 yrs since half life is 24000 yrs not 12000 yrs