Suppose you found a material in which 12.5% of the orginal radioactive atomes were present. if the half is 470 years, how old is the material

1410years

Explanation:

  ..........................equ 1

where = mass remaining

          = Original mass.  

          t=time

           = half life

Substitute into equ 1

n=3

     t=470*3

     t=1410years

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds