8. Suppose your penny isotopes have a half-life of 30 years. Calculate the age of the rock or fossil that contains these isotopes AND the percentage of remaining parent (radioactive) isotope for the
following situations:
a. After 2 half-lives
I
b. After 1 half-life
C. After 4 half-lives
ЗА
DBZ

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

i have no clue hope you find the answer