What is the age of a meteorite if potassium-40 decayed from 80 g to 10 g? The half-life of potassium-40 is 1.3 billion years.

10 / 80 amount of potassium-40 remaining

1/8 = 1/2 * 1/2 * 1/2 = 3 half-lives

3 half-lives * 1.3E9 yrs / half-life = 3.9E9 yrrs

After 3.9 billion years the 80 g will have decayed to 10 g

this a false

explanation:

0.3x0.21x0.08kg=mass 1 sheet

mass 500 = 500xmass 1

volume pile = 0.3x0.2x0.048

density=mass/volume= 500xmass 1/0.3x0.2x0.048

v patient student