Purpose:
Show the difference between pendula with small amplitude and large amplitude of oscillation, and to show rotational motion where the kinetic energy at the top is much less than the change of potential energy from the top to the bottom of the oscillation.
Purpose:
Demonstrate that the bound electrons in an atom can only occupy discrete energy levels, by determining the quantum of energy such an electron can absorb.
Purpose:
Demonstrate a monomolecular layer of oleic acid molecules held together by surface tension, and to experimentally determine the length of the oleic acid molecule.