Two identical tiny spheres have the same electric charge. If their separation is doubled, the force each exerts on the other will be (a) half.
(b) double.
(c) four times larger.
(d) one-quarter as large.
(e) unchanged.

Daughter element the new element produced along with a decay particle in a nuclear transmutation 2. half-life the substance that decays in a nuclear transmutation 3. parent element the change of one chemical element into another by nuclear decay or radioactive bombardment 4. transmutation the time required for the decay of one-half of the atoms in a sample of radioactive material