# Exponential decay

## Homework Statement

The half life of radioactive Uranium II is about 250,000 years. What percent of radioactive uranium will remain after 10,000 years?

## The Attempt at a Solution

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for every 250000, there is 50% left from original mass
10000/250000=.04 of what?
[snipped]
There is an equation, but over here its night time and my brain is turned off, so i did it algebraicly

Last edited:
D H
Staff Emeritus
silvashadow, did you read the rules? Do not post complete solutions to homework problems. Our job is to help students learn. Simply giving the answers is not helping them.

Even more importantly, do not post incorrect solutions. The algebraic approach is approximately correct.

amanaka, do you know what the relevant equations are for radioactive decay?

silvashadow, did you read the rules? Do not post complete solutions to homework problems. Our job is to help students learn. Simply giving the answers is not helping them.

Even more importantly, do not post incorrect solutions. The algebraic approach is approximately correct.

amanaka, do you know what the relevant equations are for radioactive decay?
I'm so sorry. Please forgive my incompetence.