What is the energy of an electromagnetic wave that has a frequency of
4.0 x 10° Hz? Use the equation E = hf, where h = 6.626 x 10-34 Jós.

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