Answer:
Explanation:
As we know by radioactivity law
so here we will have
now we will have
now we also know that
4 days
either multiply 128 by .5 until you get to 2 counting each time or use 2 formulas ln(n2/n1)=-k(t2-t1) to get k then input k into ln(2)=k*t1/2
n2 is final amount and n1 is beginning and t is either time elapsed as in the first formula or the actual half life that is t1/2
I,J,h,g,f,e,d,c,b,a
I believe it is the block of lead
Glucose, Carbon, water
Hope this helps!
Corvette Corvette
teehee
The answer is A btw :)