REVIEW QUESTIONS
1. Answer the review questions 1,2,3,5,7, 10 through 15,19 through 25,29, and 30
on page 578-579 of Hewitt.
2. Answer the review questions 7, and 9 through 15, and 17 through 20 on page
593 of Hewitt.
EXERCISES
1. The photoelectric effect best demonstrates
a. the wave nature of light.
b. the particle nature of light.
c. both of these.
d. none of these.
2. In the photoelectric effect, the brighter the illuminating light on the surface,
the greater
a. the number of ejected electrons.
b. the velocity of ejected electrons.
c. both of these.
d. neither of these.
3. A quantum of light is called a
a. proton.
b. neutron.
c. electron.
d. notron.
e. none of these.
4. In the double slit experiment with electrons the pattern observed on the
screen is
a. wave-like.
b. particle-like.
c. neither of these.
d. both of these.
5. Quantum uncertainties are most predominant for simultaneously
measuring the speed and location of
a. a baseball.
b. a spitball.
c. an electron.
6. The uncertainty principle applies not only to momentum and position, but to
energy and time. This statement is
a. true.
b. false.
7. According to the uncertainty principle, the more we know about a particle's
momentum, the less we know about its
a. kinetic energy.
b. mass.
c. speed.
d. location.
e. none of these.
8. In the relationship E=hn for a photon emitted from an atom, the symbol E is
used to represent the energy
a. of the emitted photon.
b. difference between atomic energy states producing the photon.
c. both of these.
d. neither of these.
9. Two photons have the same wavelength. They also have the same
a. frequency.
b. energy.
c. both of these.
d. neither of these.
10. An electron and a baseball move at the same speed. Which has the the longer
wavelength?
a. The electron
b. The baseball
c. Both have the same wavelength.
11. If a proton and an electron have identical momenta, the longer wavelength
belongs to the
a. proton.
b. electron.
c. both are the same.
12. According to the uncertainty principle, the more we know about a particle's
position, the less we know about the particle's
a. speed.
b. momentum.
c. kinetic energy.
d. all of these.
e. none of these.
13. According to quantum physics, measuring the velocity of a tiny particle with
an electromagnet
a. affects the velocity of the particle.
b. has no effect on the velocity of the particle.
14. In the photoelectric effect, electrons ejected from bound states in the
photosensitive material have
a. less kinetic energy than the absorbed photon's energy.
b. more kinetic energy than the absorbed photon's energy.
c. kinetic energy equal to the absorbed photon's energy.
15. The Schrsdinger equation is restricted to
a. submicroscopic particles.
b. submicroscopic particles and microscopic particles.
c. none of these.
16. Which of the following forms an interference pattern when directed toward
two suitably spaced slits?
a. light
b. sound
c. electrons
d. all of these
e. none of these
17. A beam of electrons has
a. wave properties.
b. particle properties.
c. both of these.
d. neither of these.
18. Heavy atoms are not appreciably larger in size than light atoms because the
nuclei of heavy atoms have more
a. mass.
b. electric charge.
c. nucleons.
d. all of these.
e. none of these.
19. The correspondence principle applies to
a. theories of submicroscopic particles.
b. theories of macroscopic particles.
c. all good theories.
20. A new theory conforms to the correspondence principle when it
a. corresponds to all theories in nature.
b. updates the essence of the old theory.
c. ties two or more theories together.
d. accounts for verified results of the old theory.
e. none of these.
21. The quantum mechanical probability cloud for the electron in the hydrogen
atom has an average radius
a. quite different than the radius predicted by Bohr.
b. that agrees with the orbital radius of Bohr.
22. An excited atom decays to its ground state and emits a photon of green light.
If instead the atom decays to an intermediate state, then the light could be
a. red.
b. violet.
c. blue.
d. any of these.
e. none of these.
23. The probability of finding a particle at a given point in space is
a. given by the frequency of the matter wave associated with the particle.
b. the square of the amplitude of the matter wave associated with the particle.
c. neither of these.
d. both of these.
24. The Uncertainty Principle states that
a. everything is completely random.
b. there are certain limits on how accurately certain properties can be known.
c. the position and momentum of microscopic particles are unknown.
d. none of these.
25. Complementary properties are
a. nice to each other.
b. produce great color schemes.
c. describe different aspects of an object.
d. are the same.'
26. Young's double slit experiment showed that
a. electrons had wave-like properties.
b. photons had particle-like properties.
c. photons had wave-like properties.
d. none of these.
e. all of these.
27. Nodes of de Broglie waves are
a. positions of zero amplitude.
b. positions of zero probability of finding particles associated with the
de Broglie wave.
c. indicative of the overtone level of the wave.
d. none of these.
e. all of these.
LESSON ASSIGNMENT
1. Describe and name the experiment that shows that light is made up of
waves. How does this experiment show that light is made of waves?
2. Describe the experiment that shows that light is made of particles and
explain why it shows that light is made of particles.
'
3. State Heisenberg's uncertainty principle for two sets of complementary
properties. What does it tell us about the nature of physical reality?
4. In what fundamental respect does the classical mechanical picture of
physical reality differ from the quantum mechanical one?