Register
The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half of its initial mass. Starting with 195 g of radioactive isotope how much will be left after
206k views
4 votes
The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half of its initial mass. Starting with 195 g of radioactive isotope how much will be left after five lives? round to the nearest gram

User Recker
by
7.2k points

1 Answer

2 votes
1st half life: 195/2 = 97.5 g
2nd half life: 97.5/2 = 48.75 g
3rd half life: 48.7/2 = 24.375 g
4th half life: 24.375/2 = 12.1875 g
5th half life: 12.1875/2 = 6.09375 g

or you can do
195(2)^(-5) = 6.09375
** rounded to nearest gram = 6 g

User Tuxxi
by
8.4k points
← Prev Question Next Question →

No related questions found

Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Other Questions

How do you estimate of 4 5/8 X 1/3
A bathtub is being filled with water. After 3 minutes 4/5 of the tub is full. Assuming the rate is constant, how much longer will it take to fill the tub?
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
Write words to match the expression. 24- ( 6+3)
9/10 divided by (1/10 plus 2/5)
Link Copied!