IB Quantum
1.	A photon emitted from the nucleus of an atom contains energy. The ratio of the photon energy to the frequency is
A. the speed of light
B. the speed of light squared
C. Planck's constant
D. the photon wavelength
? A B C D
2. Photons can exhibit wave and particle properties. In which of these experiments are these properties evident?
Wave properties Particle properties
A Double slit interference Diffraction
B Double slit interference The photoelectric effect
C Diffraction Double slit interference
D The photoelectric effect Diffraction
3. In the photoelectric effect, light is incident on a clean metal plate and electrons are lost from the surface of the metal. The amount of energy required to liberate a single electron is equal to
A. the photon energy
B. the kinetic energy of the electron
C. the work function of the metal
D. the stopping potential applied
4. Which of the following graphs correctly shows the variation of kinetic energy of the emitted electrons with frequency of applied radiation?
5. A clean sodium metal is tested under a lamp, but no photoelectrons are emitted. To produce photoelectrons, what changes should take place?
A. The metal should be replaced with a metal of higher work function
B. The lamp should be replaced with an identical one of higher power output
C. A higher frequency light source should be used
D. A longer wavelength light source should be used
6. The electrons liberated from a clean metal surface produced by the photoelectric effect can be measured by a current flowing in an external circuit. What effect will there be on the current flowing and the stopping potential if the metal is replaced with one with a lower work function?
photoelectric current stopping potential
A increases increases
B stays the same increases
C increases stays the same
D stays the same decreases
7. The position and the momentum of a particle can never be both known precisely. This law is called
A. Schrodinger's hypothesis
B. the De Broglie hypothesis
C. Heisenberg's uncertainty principle
D. Einstein's mass - energy equivalence
8. A beam of electrons is directed at a thin slit as shown in the diagram.
The minimum uncertainty in the momentum of an electron, Δp is
in the x direction
4 π x
in the y direction
C. 0 in the x direction
D. 0 in the y direction
9. For an electron in a circular orbit around a hydrogen nucleus (as given by the Bohr model of the atom), the angular momentum is given by
A. mv2
B. mrv2
C. mv2/r
D. mrv2
10. The wavefunction of a particle is a function that gives the properties across space. The square of the amplitude of the wavefunction at a point is proportional to the
A. intensity of the particle at that point
B. probability of the particle being found at that point
C. energy of the particle at that point
D. uncertainty of the momentum of the particle at that point
Save and move on