Yeah

We have this equation
1mg (current amount) = N_0*e^-kt

And we already know k

All we need is the initial amount

I see

We have 1mg, our current, plus .01/11%

Because remember, we have a certain amount of K-40 that had to decay into .01mg of Argon

And that argon is 11% of that

So .01/11% will get us the amount that decayed

Still with me?

I’m trying to get this last part

Okay

Now

Yeah

Doing some fancy maths

We can isolate t

Lol

And calculate it to be 157 million years

This

Thus

We know the age of our rock

The potassium?

The rock as a whole

Do you see why this works now?

No

Hold on sorry

What don’t you understand

But that doesn’t prove it, if we knew before how old it was and we calculated to get the same date that would be accuracy wouldn’t it

I mean we assumed that its 157 million years but how did scientists find that out

Wow

Couldn’t have been with this method

We didn’t **assume** 157 million years

I just showed you how we calculated that

It was calculated, lol

I *just* showed you

Yeah u did

omfg

We isolated t

And we calculated 157 million

But u said that we put the 1.25 billion into the equation

That’s the half life of K-40