Quiz 11
1) Data was collected for a thin lens by varying the object distance and locating the
image. From the graph and the thin lens equation, what is the focal length of the lens
(to the correct number of significant figures)? Ans: 14 cm
2) Two spheres are made from the same
material, but one is hollow and the other
solid. Which sphere expands more?
a)
b)
c)
d)
The hollow sphere
The solid sphere
They expand the same
Not enough information
3) A grandfather clock depends on the period
to keep time. Suppose the clock is calibrated
correctly at sea level and then taken to the
top of a very high mountain. Does the clock
now run…
a) Fast
b) Slow
c) correctly
4) Light passes from a material with index
of refraction 1.3 into one with index 1.2.
Compared to the incident ray, what
happens to the refracted ray?
a) It bends towards the normal.
b) It bends away from the normal.
c) It is undeflected.
5)An electron and a proton both moving at
nonrelativistic speeds have the same de
Broglie wavelength. Which of the following
quantities are also the same for the
particles?
a)
b)
c)
d)
Speed
Kinetic energy
Momentum
frequency
6) The amplitude of a wave is doubled with
no other changes made to the wave. As a
result of this doubling, which of the
following statements is correct?
a) The speed of the wave changes.
b) The frequency of the wave changes.
c) The maximum transverse speed of an
element of the medium changes.
d) Statements a-c are all true.
e) None of statements a-c are true.
7) In the last 3 columns fill in the
correct signs (+, -, 0) for Q, W, and
U.
Situation
System
Q W U
Rapidly pumping up a
bicycle tire
Air in the pump
0
+
+
Pan of room temperature
water sitting on a hot stove
Water in the pan
+
0
+
Air quickly leaking out of a
balloon
Air originally in
the balloon
0
-
-
8) A camera can be modeled as a simple
converging lens that focuses an image on
the CCD acting as a screen. A camera is
initially focused on a distant object. To
focus the image of an object close to the
camera, must the lens be …
a) moved away from the CCD.
b) left where it is.
c) moved toward the CCD.
9) Consider an electron, a proton, and a helium
nucleus, each trapped separately in identical
boxes. Which particle has the longest wavelength
in the ground state?
a)
b)
c)
d)
The electron
The proton
The helium nucleus
They all have the same wavelength.
10) Increasing the intensity of a sound by a
factor of 100 causes the sound level to
increase by what amount?
a)
b)
c)
d)
100 dB
20 dB
10 dB
2 dB
11) The molar specific heat of a diatomic gas is
measured at constant volume and found to be 29.1
J/mol K. What are the types of energy that are
contributing to the molar specific heat?
a)
b)
c)
d)
Translation only
Translation and rotation only
Translation and vibration only
Translation, rotation, and
vibration
12) Which of the following causes the fringes in a
two slit interference pattern to move farther
apart?
a) Decreasing the wavelength of the
light
b) Decreasing the screen distance L
c) Decreasing the slit separation d
d) Immersing the entire apparatus in
water.
13) A hydrogen atom is in its ground state.
Incident on the atoms are many photons each
having an energy of 10.5 eV. What is the results.
a) The atom is excited to a higher allowed
state.
b) The atom is ionized.
c) The photons pass by the atom without
interaction.
14) An ideal gas is taken from an initial
temperature Ti to a higher final temperature Tf
along two different reversible paths. Path A is at
constant pressure and path B is at constant
volume. What is the relation between the entropy
changes of the gas for these paths?
a) SA > SB
b) SA = SB
c) SA < SB
15) A polarizer for microwaves can be made as a
grid of parallel wires approximately 1 cm apart.
The electric field vector for microwaves
transmitted through this polarizer is
a) parallel to the metal wires.
b) perpendicular to the metal wires.