Planck's constant relates the energy of a photon to its:

The quantum of light energy is called a:

The Bohr model of the atom proposed that electrons move in:

According to Einstein's mass-energy equivalence, E equals:

X-rays were discovered by:

Einstein's theory of relativity introduced the concept of:

The atomic nucleus was discovered through experiments conducted by:

The photoelectric effect demonstrates that light behaves as a:

The electron was discovered by:

The photoelectric effect was explained by:

The neutron was discovered by: