AP Atomic and Quantum Physics

De Broglie equation

• relates the momentum of a mass to its wavelength

• relates the energy of a mass to its wavelength

• relates the frequency of a mass to its wavelength

• relates the work function of a mass to its wavelength

If waves can behave like particles, then particles can behave like a wave. This is the idea behind...

• Quantization of Energy

• Photoelectric Effect

• Compton Effect

• deBroglie Waves

• Uncertainty Principle

A ____ is a discrete, quantized bundle of energy

• Photoelectric effect

• Photon

• Quantized

• Proton

The de-Broglie wavelength of an electron is 5 Angstrom (1 Angstrom = 10^-10 meters). Then its momentum is

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• 
• 
• 

J.J. Thomson discovered the electron using

• gold foil and alpha particles.

• oil drops.

• a cathode ray tube.

• emission spectra of a hydrogen atom.

Rutherford realized that the atomic nucleus was positively charged because

• it attracted alpha particles.

• it deflected alpha particles.

• it had no effect on alpha particles.

• it produced alpha particles.

Niels Bohr added _______________ to the model of the atom.

• electrons.

• a nucleus.

• neutrons.

• energy levels.

J.J. Thomson discovered electrons, and he also knew that atoms are neutral. From these two facts, Thomson inferred that the atom also contains

• positive material.

• a nucleus.

• neutrons.

• energy levels.

Which of the following is the best description of J.J. Thomson's model of the atom?

• a featureless, indivisible sphere

• a sphere of positive material with electrons embedded in it

• mostly empty space with electrons randomly orbiting around a positive nucleus

• mostly empty space with electrons located in set orbits around a positive nucleus.

A line emission spectrum is produced when electrons

• become excited and move from ground state to higher levels in an atom.

• leave the atom completely.

• fall from higher, excited states back to lower or ground state.

• move from a cathode to an anode.