Posted by **Darwin12** on Wednesday, December 12, 2012 at 6:54pm.

In 10 years, 25% of a radioactive substance decays. What is its half-life?

A. 25 years

B. 24 years

C. 20 years

D. 29 years

## Answer this Question

## Related Questions

- Math - In 10 years, 25% of a radioactive substance decays. What is its half-life...
- Calculus - The half life of a certain radioactive substance is 10 years. How ...
- algebra - A radioactive substance decays according to the formula A=A0e^kt where...
- calculus - The rate at which an amount of a radioactive substance decays is ...
- precal - If the half-life of a certain radioactive substance is 2000 years, ...
- Science - A material has 32 atoms in all; 24 decayed and the rest undecayed. If ...
- Science - Can anyone help me find the half-life of strontium-90? I also need an ...
- Science - If a 20 gram sample of a radioactive substance has a half-life of 6000...
- Physics - Suppose you have 100 g of radioactive plutonium-239 with a half-life ...
- Physics - Suppose you have 100 g of radioactive plutonium-239 with a half-life ...