Question

FASTTT FOR BRAINLIST
Mrs. Smitherman’s lab has a sample of a radioactive potassium isotope with a half-life of one week.
How much of the original sample would be left in the lab at the end of the third week?
A 1/8
B 1/4
C 1/2
D 1

Answer 1

the answer should be A?

Answer 2

A at the end of three weeks there will be 1/8 left