Question

How many grams of a 1000-gram radioactive sample are left after 3 half-lives? *

1 point
1000 grams
500 grams
250 grams
125 grams
2000 grams

Answer 1

first half of 1000gram=1000/2=500g

second half of 1000gram=500/2=250g

third half of 1000gram=250/2=125 g

Step-by-step explanation:

in simple

third half of 1000 g=1000/(2³)=125gram

Answer 2

The answer is 125 gms.