A projectile launched horizontally hits the ground in 0.5 seconds. If it had been launched with mush higher speed in the same direction it would have it the ground in

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