Complete the table for the radioactive isotope. (Round your answers to two decimal places.)
Isotope 226Ra

Half-Life 1599

Initial 250 g

Find

decay after

1000 Years Amount
After
2,000 Year

Question

Complete the table for the radioactive isotope. (Round your answers to two decimal places.)
Isotope	226Ra

Half-Life 1599

Initial 250 g

Find

decay after

1000 Years	Amount
After
2,000 Year

anonymous · Answer

cool

konradzuse · Answer

y = 250e^kt

konradzuse · Answer

y = 250e^k(1599)

chaise · Answer

125=250e^(-k*1599)

Make sure your k is negative, now solve for k. Do you understand how I got y=125?

konradzuse · Answer

half of 250?  Other than that idk.

chaise · Answer

Yes :) because it is the half life. The time it takes for the material to decay to half of its original value.

chaise · Answer

125=250e^(-1599k)

(ln(125/250))/-1599=k

Make sense?

konradzuse · Answer

okies :)  yup

chaise · Answer

Too easy. You got it from here, or still need help?

konradzuse · Answer

so y = 250e^((ln(125/250))/-1599) * 1000?

konradzuse · Answer

When I type that in I get 250108.0....