The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 140
grams of a radioactive isotope, how much will be left after 5 half-lives?
round your answer to the nearest gram.

Question

The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 140
grams of a radioactive isotope, how much will be left after 5 half-lives?
 round your answer to the nearest gram.

noodya123 · Answer

i got 4.375 but im not sure if thats correct

mrnood · Answer

I answered this just a few moments ago (with marginally differnt numbers)

If oyu explain how oyu did it I will confirm whether you are correct

noodya123 · Answer

i know you did i did it myself this time im just not sure if its correct i did 140 * 0.5^5 and got 4.375

mrnood · Answer

That is correct

noodya123 · Answer

thank you

mrnood · Answer

np