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September 21, 2014

September 21, 2014

Posted by **Beth** on Friday, July 27, 2012 at 5:26pm.

I understand that I have to use the equation A=Ao EXP(-wavelength x T) and once i plug in the answer it always turns out to be 7300 or so which is the incorrect answer. Therfore allwing me not to be able to solve B. If anyone can help me in where my calculations went wrong that would be greatly appriciated.

- Physics -
**Elena**, Saturday, July 28, 2012 at 3:45pmA=Aₒ•e(-λ•t).

λ is the decay constant (not the wavelength!!!)

λ=ln2/T, where T is half-life

A/Aₒ= e(- ln2•t/T).

ln(A/Aₒ)= - ln2•t/T

ln(0.15/0.23)=ln(0.652)=

= - 4.27 = -ln2 •t/5730.

t=4.27•5730/ln2=35299 years

15% •35299/100% =5295 years

Ans. 35299±5295 years

- Physics -
**Anonymous**, Tuesday, August 14, 2012 at 9:02pmthis is wrong

- Physics -
**Aaron**, Monday, July 29, 2013 at 3:12pmElena was so close, it looks like a calculator error when calculating part A. The answer is off by a factor of ten. So 3529.9 years, not 35299.

- Physics -
**Derp**, Monday, July 29, 2013 at 6:01pmGood Guy Aaron

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