Posted by **Freddo** on Saturday, August 24, 2013 at 3:44pm.

Hi

Radioactive decay -

A radioactive nuclide has a decay constant of - 10^-6 s-1 what is its half life ?

I have come up with

is IN (2) / 0.000001 s-1 = 693147.18055

which i am having troube working into real figures

Can anyone help please .. thanks

- Physics ... -
**bob pursley**, Saturday, August 24, 2013 at 4:13pm
.5=e^-kt=e^-1E-6t

thalfffffffffffff=-ln.5/1E-6

I agree with that answer, 693 thousand seconds, or about 8 days. Work it out exactly.

- Physics ... -
**Freddo**, Saturday, August 24, 2013 at 5:33pm
Thank you for your time ..

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