Do we need to know this exponential decay??

[polarmolar]

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Do we?

 

[xaznxcountx]

Just memorize the equation, its pretty much plug and chug.

 

[polarmolar]

Just memorize the equation, its pretty much plug and chug.

Can you post the equation with an example? thanks!

 

[glk2101]

N=No (e)^(-lambda * time)

so if you want the half life N=.5 and the equation simplifies to
t(.5)=ln 2/lambda

 

[polarmolar]

N=No (e)^(-lambda * time)

so if you want the half life N=.5 and the equation simplifies to
t(.5)=ln 2/lambda

I'm confused...is it this formula: T1/2 = .693 / k ??

Where did you get the first formula u wrote and how would be find "e" ?

 

[polarmolar]

Can someone please explain this, how would we find "e" without a calculator?

 

[glk2101]

yea thats the equation that you wrote, except lambda = k i think?
i guess i just memorized that equation, not sure how to work with e without a calculator