1.

Who was the first scientist to propose that the atom had a dense nucleus which occupied only a small fraction of the volume of the atom?

A) Planck B) Bohr C) Rydberg D) Rutherford E) Thomson

2.

Who was the first scientist to propose that an object could emit only certain amounts of energy?

A) Planck B) Einstein C) Bohr D) Rydberg E) de Broglie

3.

Who proposed a model that successfully explained the photoelectric effect?

A) Planck B) Einstein C) Compton D) Rydberg E) Bohr