Question

A meteorite contains 80 grams of radioactive chemical 'Q' when it lands on the Graeters in
Worthington. By the time NASA gets to the site (18 hours later), the sample is only 10 grams.

Answer 1

• Initial amount=80g

For first half life :-

• Remaining amount=80/2=40g

For second half life:-

• Remaining amount=40/2=20g

For third half life:-

• Remaining amount=20/2=10g

This is the amount remains while NASA reached the site .

3 half-lives have been gone .

Let half life be x

• 3x=18h
• x=6h

Half life is 6hrs

You can also solve it by using formula .Check the link below,I answered by using formula .

https://brainly.com/question/26003472?