Posted by **Lee** on Sunday, November 8, 2009 at 7:47pm.

A sample of a radioactive substance decayed to 93.5% of its original amount after a year.

a) What is the half-life of the substance?

? years

(b) How long would it take the sample to decay to 10% of its original amount?

? years

## Answer This Question

## Related Questions

- calculus - A sample of a radioactive substance decayed to 94.5% of its original ...
- calculus - The rate at which an amount of a radioactive substance decays is ...
- Science - Radioactive substance decays so that after t years, the amount ...
- pre calc - You have a sample of a certain radioactive substance. After two days...
- pre calc - You have a sample of a certain radioactive substance. After two days...
- Math - A radioactive substance decays according to the formula Q(t) = Q0e−...
- Math - A radioactive substance decays according to the formula Q(t) = Q0e−...
- algebra - A radioactive substance decays according to the formula A=A0e^kt where...
- Exponential Modeling - The half-life of a radioactive substance is one day, ...
- calculus - Carbon-14 is a radioactive substance produced in the Earth's ...

More Related Questions