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Quantum and Atomic Physics - Multiple Choice
PSI AP Physics 2
Name______________________________
1. The “Cathode Ray Tube” experiment is associated with:
(A) J. J. Thomson
(B) J. S. Townsend
(C) M. Plank
(D) A. H. Compton
2. The electron charge was measured the first time in:
(A) Cathode ray experiment
(B) Photoelectric effect experiment
(C) Oil drop experiment
(D) Compton effect experiment
3. What is the difference between cathode rays and X-rays?
(A) Both rays are made up of particles.
(B) Both rays are different types of electromagnetic radiation.
(C) Cathode rays are particles and X-rays are electromagnetic radiation.
(D) Cathode rays are electromagnetic radiation and X-rays are particles.
4. What distinctive phenomena are illustrated in X-ray spectra? (Select 2 answers)
(A) Bremsstrahlung - deceleration of the electrons striking the anode.
(B) Acceleration of the electrons after they strike the anode.
(C) Internal atomic structure of the anode.
(D) Cathode ray penetration power.
5. Which of the following colors indicates an object of the lowest temperature?
(A) Violet
(B) Blue
(C) Yellow
(D) Red
6. Which is a property of a black body radiator?
(A) It absorbs all incident radiation, then re-emits it at a frequencies determined by its temperature.
(B) It is always black, even when heated to high temperatures.
(C) It absorbs all incident radiation and does not re-emit any radiation.
(D) As it is heated, it changes color from black to blue to red.
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PSI AP Physics 2
Quantum and Atomic Physics
Quantum and Atomic Physics - Multiple Choice
7. Which of the following photons has the greatest energy?
(A) Infrared
(B) Blue
(C) γ- photon
(D) ultraviolet – photon
8. What discrepancy between experiment and theory helped lead Max Planck to his quantum theory?
(A) The discovery of Cathode Rays.
(B) The discovery of X-Rays.
(C) The Ultraviolet Catastrophe.
(D) The discovery of electrons.
9. The energy of a photon depends on:
(A) Amplitude
(B) Speed
(C) Temperature
(D) Frequency
10. How does the energy of a photon change if the wavelength is doubled?
(A) Energy doubles
(B) Energy quadruples
(C) Energy stays the same
(D) Energy is halved
11. How does the momentum of a photon change if the wavelength is halved?
(A) Doubles
(B) Quadruples
(C) Stays the same
(D) Is cut to one-half
12. The photoelectric effect explains:
(A) The wave nature of light
(B) The particle nature of light
(C) The wave properties of an electron
(D) The atomic structure
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PSI AP Physics 2
Quantum and Atomic Physics
Quantum and Atomic Physics - Multiple Choice
13. The kinetic energy of photo-electrons depends on (Select 2 answers):
(A) Angle of illumination
(B) Intensity of light
(C) Work function
(D) Wavelength of light
14. Which of the following is the formula of the photon momentum?
(A) p = hf/c
(B) p = cλ/h
(C) p = hc/f
(D) p = E/mc
15. The stopping potential of photo-electrons depends on which of the following… (Select 2 answers)
(A) The light intensity
(B) The frequency of the photons
(C) The composition of the metal surface
(D) The speed of the incoming photons
16. Which of the following formulas expresses the photoelectric effect?
(A) hλ = W0 + KE
(B) hf = W0 - KE
(C) hf = W0 + KE
(D) hλ = -W0 + KE
17. Which of the following graphs correctly relates the maximum kinetic energy of photo-electrons and
the frequency of the incident light?
(A)
(B)
(C)
(D)
18. Which of the following graphs correctly relates the maximum kinetic energy of photo-electrons and
the intensity of the incident light?
intensity
intensity
(A)
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(B)
intensity
(C)
PSI AP Physics 2
intensity
(D)
Quantum and Atomic Physics
Quantum and Atomic Physics - Multiple Choice
19. Which of the following graphs correctly relates the de Broglie wavelength and the linear momentum
of a particle?
(A)
(B)
(C)
(D)
20. All of the following are properties of γ-rays EXCEPT:
(A) They discharge electrified objects
(B) They ionize gases
(C) They are deflected by magnetic fields
(D) They penetrate objects
21. Which of the following phenomena provides the best evidence that light can have particle
properties?
(A) Diffraction of light
(B) Compton scattering
(C) Electron diffraction
(D) γ-ray diffraction
22. Which of the following phenomena provides the best evidence that particles can have wave
properties?
(A) The absorption of photons by electrons in an atom
(B) The interference pattern produced by neutrons incident on a crystal
(C) The production of x-rays by electrons striking a metal target
(D) Compton scattering
23. Which of the following formulas can be used to determine the de Broglie wavelength?
(A) λ = hmv
(B) λ = h/mv
(C) λ = mv/h
(D) λ = mc/h
24. A photon can disappear producing an electron and positron. What is this phenomenon called?
(A) X-Rays diffraction
(B) Electron scattering
(C) Annihilation
(D) Pair production
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PSI AP Physics 2
Quantum and Atomic Physics
Quantum and Atomic Physics - Multiple Choice
25. When a proton collides with an antiproton they disappear producing photons. This phenomenon is
called…
(A) X-Rays diffraction
(B) Electron scattering
(C) Annihilation
(D) Pair production
26. The following statement: “In order to understand a given experiment, we must use either the wave or
particle theory, but not both” is called?
(A) Wave theory of light
(B) Particle theory of light
(C) Principle of complementarity
(D) Wave theory of matter
27. Electrons are accelerated to a maximum speed of v in an X-Ray tube by an applied voltage V0. What is
the maximum speed of the electrons if the voltage is quadrupled?
(A) 4v
(B) 2v
(C) √2 v
(D) v/4
28. In a Compton Effect experiment a photon scattered from an electron at
rest increases its wavelength. Which of the following deflection angles θ
provides the greatest increase in the wavelength of the scattered photon?
(A) 0°
(B) 60°
(C) 90°
(D) 180°
29. If all of the following objects move at the same speed, which one will have
the greatest deBroglie wavelength?
(A) Neutron
(B) Electron
(C) Bowling ball
(D) α- Particle
30. Rutherford’s “Scattering α–particles by a gold foil” experiment disproved which of the following:
(A) Plum-pudding model of the atom
(B) Planetary model of the atom
(C) De Broglie hypothesis
(D) Wave nature of light
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PSI AP Physics 2
Quantum and Atomic Physics
Quantum and Atomic Physics - Multiple Choice
31. In Rutherford’s experiment, most of α – particles pass through the foil without deflection. Which of
the following properties of the atom can be explained by this observation? (Select 2 answers)
(A) An atom’s positive charge is concentrated in the nucleus
(B) The nucleus is made up neutrons and protons
(C) Electrons move around the nucleus in orbits of quantized energy and angular momentum
(D) An atom is mostly empty space
32. Which of the following statement(s) can be associated with Bohr’s theory of the atom? (Select 2
answers)
(A) An electron orbiting the nucleus can change its energy continuously
(B) An electron orbiting the nucleus emits energy and falls on the nucleus
(C) An electron can change its energy only by a certain portion when it jumps between the orbits
(D) The angular momentum of an electron around the nucleus is equal an integer times h/2π
33. When an electron falls from an orbit the first excited state (n=2) to the ground state (n=1):
(A) A photon is emitted
(B) A photon is absorbed
(C) No photons are involved
(D) An electron is emitted
34. In the Bohr model, when an electron jumps from the n = 1 orbit (of radius r1) to the n = 3 orbit, what
is its new orbital radius as a proportion of r1?
(A) r1/9
(B) r1/3
(C) 3 r1
(D) 9 r1
35. In the Bohr model, when an electron jumps from the n = 1 orbit (of energy E1) to the n = 4 orbit, what
is its new energy as a proportion of E1?
(A) E1/9
(B) E1/16
(C) 4 E1
(D) 16 E1
36. In the Bohr model, when an electron orbits a single proton in the n = 5 state, how many deBroglie
wavelengths fit onto the circumference of this orbit?
(A) 3
(B) 4
(C) 5
(D) 6
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PSI AP Physics 2
Quantum and Atomic Physics
Quantum and Atomic Physics - Multiple Choice
37. An electron accelerated from rest by a 600V potential difference has a De Broglie wavelength of λ.
What would the electron’s De Broglie wavelength be if the potential difference had been 150 V?
(A) 2 λ
(B) λ /2
(C) λ /4
(D) 4 λ
38. According to Maxwell’s theory of electromagnetism, an electron orbiting a nucleus must:
(A) Change its energy in quantized amounts
(B) Conserve its angular momentum
(C) Conserve its energy
(D) Radiate its energy
39. A hypothetical atom has energy levels as shown by the graph
(right). An electron is excited from the ground state to the -1 eV
energy level. Which of the following are the energies of the emitted
photons? (Select 2 answers)
(A) 2 eV
(B) 4 eV
(C) 10 eV
(D) 11 eV
40. A container is filled with a gas consisting of atoms in the ground state.
The energy energy level diagram for the atoms is shown on the right.
The gas is irradiated with electromagnetic radiation with the energy
range from 4 eV to 9 eV. Which set of photon energies might be
found in the emission spectrum.
(A) 1 eV, 2 eV, and 6 eV
(B) 2 eV, 3 eV, and 4 eV
(C) 1 eV, 3 eV, and 5 eV
(D) 7 eV, 8 eV, and 9 eV
41. A container is filled with a gas consisting of atoms in the ground state.
The energy energy level diagram for the atoms is shown on the right.
The gas is irradiated with electro-magnetic radiation with the energy
range from 4 eV to 9 eV. Which of the following transitions will produce
a photon with the longest wavelength?
(A) From n = 4 to n = 1
(B) From n = 2 to n = 1
(C) From n = 3 to n = 1
(D) From n = 4 to n = 3
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PSI AP Physics 2
Quantum and Atomic Physics
Quantum and Atomic Physics - Multiple Choice
42. According to the Bohr’s theory of the hydrogen atom, electrons starting in the 4th energy level and
eventually ending in the ground state could produce a total of how many different spectral lines?
(A) 3
(B) 4
(C) 6
(D) 9
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PSI AP Physics 2
Quantum and Atomic Physics
Quantum and Atomic Physics - Multiple Choice
Multiple Choice Answers
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A
C
C
A,C
D
A
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7.
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C
C
D
D
A
B
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C,D
A
B,C
C
C
A
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24.
D
B
B
B
B
D
PSI AP Physics 2
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C
C
B
D
B
A
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A,D
C,D
A
D
B
C
37.
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D
D
B,C
C
D
C
Quantum and Atomic Physics