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Decay constant

Why and how will plotting Ln N against time and then finding the gradient give me the decay constant here?
Please help me, coz i never knew about it. Is it like i ve to learn it or it can be deducted from the normal equations in the text book?
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You should know this formula and the log versions of it

N=Noe−λtN=N_o e^{-\lambda t}

lnN=−λt+LnNoln N = -\lambda t + Ln N_o

Compare the log formula with y = mx +c

Gradient is -λ


The question you posted doesn't ask for this.
Original post by Stonebridge
You should know this formula and the log versions of it

N=Noe−λtN=N_o e^{-\lambda t}

lnN=−λt+LnNoln N = -\lambda t + Ln N_o

Compare the log formula with y = mx +c

Gradient is -λ


The question you posted doesn't ask for this.


Thanks a bunch!

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