PHYSICS PHY2ZAT PAPER B
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SECTION A
ANSWER ALL QUESTIONS ON THE GRID PAPER PROVIDED
QUESTION A1
In the photoelectric effect experiment, why does red light not cause the emission of an
electron though blue light can?
A The photons of red light do not have sufficient energy to eject an electron.
B The electric field of the red light oscillates too slowly to eject an electron.
C Red light contains fewer photons than blue, not enough to eject electrons.
D The red light does not penetrate far enough into the metal electrode.
QUESTION A2
Which of the following phenomena is best explained by treating light as a wave?
A The threshold frequency in the photoelectric effect
B The emission of only certain wavelengths of light by an excited gas
C The limited resolution of a light microscope
D None of the above
QUESTION A3
According to the Heisenberg’s Uncertainty Principle, if we know the x-position of a particle
precisely, we cannot know its precise:
A y-position
B x-momentum
C y-momentum
D energy
QUESTION A4
Which of the following ideas of the Bohr model is not retained in the modern theory of atomic
structure?
A Electrons can absorb or emit energy only in whole numbers of photons.
B Atoms have a central positively charged nucleus.
C Electrons move around the nucleus as planets orbit the sun.
D Most of the volume of an atom is empty space.
QUESTION A5
The idea that no two electrons can have exactly the same set of quantum numbers is
expressed in the:
A Heisenberg’s probability position.
B Pauli exclusion principle.
C Plank’s constant
D Bohr’s model.
QUESTION A6
Which set of quantum numbers cannot occur together to specify an orbital?
A n = 2, l = 1, ml = -1, ms = ½
B n = 3, l = 2, ml = 0, ms = ½
C n = 3, l = 3, ml = 2, ms = ½
D n = 4, l = 3, ml = 0, ms = ½
, PHYSICS PHY2ZAT -2-
QUESTION A7
Which of the following statements is correct?
A Earth's geographic north pole is the magnetic north.
B The north pole of a magnet points towards the Earth's magnetic south pole.
C Like poles of a magnet attract each other and unlike poles repel.
D The SI unit of the magnetic field is the gauss.
QUESTION A8
The diagram below shows a current-carrying wire located in a magnetic field that is directed
towards the top of the page.
The magnetic force on the wire is directed out of the page. In the wire, the electron flow is
directed toward the
A right
B top of page
C left
D bottom of page
QUESTION A9
The path ABC in the diagram was followed by a charged particle in a cloud chamber.
If the magnetic field is directed into the page, the particle is
A positively charged and moved from A to C
B negatively charged and has moved from C to A
C positively charged and has moved from A to C
D negatively charge and has moved from A to C
15/…
-1-
SECTION A
ANSWER ALL QUESTIONS ON THE GRID PAPER PROVIDED
QUESTION A1
In the photoelectric effect experiment, why does red light not cause the emission of an
electron though blue light can?
A The photons of red light do not have sufficient energy to eject an electron.
B The electric field of the red light oscillates too slowly to eject an electron.
C Red light contains fewer photons than blue, not enough to eject electrons.
D The red light does not penetrate far enough into the metal electrode.
QUESTION A2
Which of the following phenomena is best explained by treating light as a wave?
A The threshold frequency in the photoelectric effect
B The emission of only certain wavelengths of light by an excited gas
C The limited resolution of a light microscope
D None of the above
QUESTION A3
According to the Heisenberg’s Uncertainty Principle, if we know the x-position of a particle
precisely, we cannot know its precise:
A y-position
B x-momentum
C y-momentum
D energy
QUESTION A4
Which of the following ideas of the Bohr model is not retained in the modern theory of atomic
structure?
A Electrons can absorb or emit energy only in whole numbers of photons.
B Atoms have a central positively charged nucleus.
C Electrons move around the nucleus as planets orbit the sun.
D Most of the volume of an atom is empty space.
QUESTION A5
The idea that no two electrons can have exactly the same set of quantum numbers is
expressed in the:
A Heisenberg’s probability position.
B Pauli exclusion principle.
C Plank’s constant
D Bohr’s model.
QUESTION A6
Which set of quantum numbers cannot occur together to specify an orbital?
A n = 2, l = 1, ml = -1, ms = ½
B n = 3, l = 2, ml = 0, ms = ½
C n = 3, l = 3, ml = 2, ms = ½
D n = 4, l = 3, ml = 0, ms = ½
, PHYSICS PHY2ZAT -2-
QUESTION A7
Which of the following statements is correct?
A Earth's geographic north pole is the magnetic north.
B The north pole of a magnet points towards the Earth's magnetic south pole.
C Like poles of a magnet attract each other and unlike poles repel.
D The SI unit of the magnetic field is the gauss.
QUESTION A8
The diagram below shows a current-carrying wire located in a magnetic field that is directed
towards the top of the page.
The magnetic force on the wire is directed out of the page. In the wire, the electron flow is
directed toward the
A right
B top of page
C left
D bottom of page
QUESTION A9
The path ABC in the diagram was followed by a charged particle in a cloud chamber.
If the magnetic field is directed into the page, the particle is
A positively charged and moved from A to C
B negatively charged and has moved from C to A
C positively charged and has moved from A to C
D negatively charge and has moved from A to C
15/…
