Sunday

March 29, 2015

March 29, 2015

Posted by **Anonymous** on Saturday, March 13, 2010 at 11:25pm.

m(t) = 70e-0.0274t

Find the half-life of thorium-234. (Round your answer to the nearest tenth.)

- math -
**Reiny**, Saturday, March 13, 2010 at 11:27pmyou would be solving

35 = 70 e^-.0274t

.5 = e^-.0274t

-.0274t = ln(.5)

t = ln(.5)/-.0274

= 25.297

half life is appr 25.3 years

**Answer this Question**

**Related Questions**

AP Calculus - An Initial amount of 100 grams of Thorium-234 decays according to ...

p - A uranium nucleus (mass 238 u), initially at rest, undergoes radioactive ...

physics - A uranium nucleus (mass 238 u), initially at rest, undergoes ...

Chemistry - How many grams of a 250- g sample of thorium - 234 would remain ...

Chemistry - Uranium-238 has half life of 4.51 * 10^9 years Uranium-234 has half ...

Algebra - The level of thorium in a sample decreases by a factor of one-half ...

algebra - The level of thorium in a sample decreases by a factor of one-half ...

A.P. Chemistry - Thorium-232 undergoes alpha decay and has a half-life of 1.4 * ...

physics - a uranium-238 nucleus may stay in one piece for billions of years, but...

Chemistry - a.) How much energy is emitted in each alpha decay of plutonium-234 ...