Posted by **Heena** on Sunday, November 14, 2010 at 12:45am.

Draw a graph to show the decay of 32g of plutonium-241. Use the graph to find the mass of plutonium-241 after 20 years.

- Physics -
**drwls**, Sunday, November 14, 2010 at 4:39am
We don't draw graphs for students here. I suggest you use semilogarithmic graph paper, with a logarithmic mass scale, and a linear scale for time. The decay curve will then be a straight line.

The half life of Pu-241 is 13 years.

M = 32*(2)^-(t/13)

LogM = Log32 -(t/13)*Log2

= 1.505 - 0.02316 t

(using log to base 10)

= 1.042 when t = 20 years

M = 11 g

About 1/3 will remain after 20 years.

## Answer this Question

## Related Questions

- algebra 4 - write an exponential decay model that describes the situation. one ...
- chemistry - You want to heat a satellite by radioactive decay of 238 plutonium. ...
- CALCULUS - A smoke detector contains 0.2 mg of Americium 241 (Am-241), a ...
- Calculus - A smoke detector contains 0.2 mg of Americium 241 (Am-241), a ...
- Calculus - A smoke detector contains 0.2 mg of Americium 241 (Am-241), a ...
- chemestry - Please answer the following THAT I CAN'T!!! Where is Plutonium found...
- Chemistry - a.) How much energy is emitted in each alpha decay of plutonium-234 ...
- physics - How many coulombs of positive charge are there in 8.70 kg of plutonium...
- physics - How many coulombs of positive charge are there in 8.70 kg of plutonium...
- chem - The half life of Am-241 is 432 y. If 2.00 g of Am-241 is present in a ...

More Related Questions