Quantum Mechanics

At what point do photons behave less like waves and more like particles?

• as the frequency of the photons increases

• as the wavelength of the photons increases

• as the intensity of the photons increases

• as the speed of the photons increases

Which of the following phenomena is the result of light’s wave properties?

• the Compton shift

• two-slit interference

• the photoelectric effect

• momentum transfer

Which of the following experiments indicated that matter waves exist?

• the emission of electrons by a metal exposed to photons

• the diffraction of electrons by a single crystal

• the change in photon wavelength during scattering by electrons

• the spontaneous emission of photons by electron transitions in an atom

Which of the following statements correctly describes the results of simultaneous measurement of momentum and location for a particle?

• Accuracy of measurement decreases as the particle mass increases.

• Neither quantity can be measured with accuracy.

• The more accurately one quantity is measured, the less accurately the other quantity is known.

• Both quantities can be measured with infinite accuracy.

Which of the following does not describe the electron cloud for an electron in the ground state of a hydrogen atom?

• The electron cloud is spherically symmetrical.

• The electron cloud’s density is close to zero near the nucleus.

• The electron cloud’s density is greatest at the Bohr radius.

• The electron cloud’s density is uniformly constant throughout.

Which of the following indicates the greatest probability for an electron’s position in the ground state of a hydrogen atom?

• the origin of the probability curve

• the middle of the rising part of the probability curve

• the middle of the peak of the probability curve

• the middle of the descending part of the probability curve