True-false questions are worth 2 points each, three-choice multiple
choice questions are worth 3 points each, five-choice multiple choice
questions are worth 6 points each. The maximum possible score is 117.
The exam period was 90 minutes; the mean was 89.8; the median was 91.
Click here to see page1 page2 of the formula sheet that came with
Some helpful information:
• A physics 102 light bulb acts just like a resistor: its
resistance is constant, independent of the current flowing through the
light bulb. The bulb's brightness increases with increasing current.
• A reminder about prefixes: p (pico) = 10-12; n
(nano) = 10-9; μ (micro) = 10-6; m (milli) =
10-3; k (kilo) = 10+3; M or Meg (mega) =
10+6; G or Gig (giga) = 10+9.
What is the resonance frequency for this circuit?
(a) 5 × 107 Hz
(b) 2 × 107 Hz
(c) 104 Hz
(d) 1125 Hz
(e) 607 Hz
(a) 40 W
(b) 60 W
(c) 80 W
What is the total energy stored in this solenoid (neglecting fringe
(a) 1.3 J
(b) 35 J
(c) 1280 J
(d) 5.6 × 104 J
(e) 9.76 × 108 J
Vertically polarized light with intensity I0 is
incident on a series of three polarizers, as in the figure below. The
middle polarizer may be rotated to any angle, θ.
For which value of θ will the most light be
(c) 0 °
(a) 0.11 I0
(b) 0.22 I0
(c) 0.33 I0
(a) 0.7071 I0
An electromagnetic wave with frequency f = 6.15 ×
1014 Hz is traveling in vacuum at a speed c = 3
× 108 m/s. The wave strikes a 9 cm2 (9
× 10-4 m2) surface oriented perpendicular to
the wave, depositing 1.35 mW of average power.
What is the wavelength of this wave?
(a) 360 nm
(b) 488 nm
(c) 530 nm
(d) 624 nm
(e) 1250 nm
(a) 8 × 10-5 J/m3
(b) 1 × 10-6 J/m3
(c) 6 × 10-7 J/m3
(d) 2 × 10-8 J/m3
(e) 5 × 10-9 J/m3
If the indices of refraction for blue and red light are
nblue and nred respectively, what is
their difference, nblue - nred ?
Assuming that each mirror is properly centered at x = 0, which
of the diagrams are correct?
(a) 1 and 2
(b) 1 and 3
(c) 2 and 3
(d) 2 and 4
(e) 3 and 4
A candle is placed 15 cm away from a convex mirror with radius of
curvature -20 cm and focal length f = -10 cm as shown in the
The image formed by the mirror is
(a) upright and reduced and virtual.
(b) inverted and enlarged and real.
(c) inverted and reduced and virtual.
(d) upright and enlarged and real.
(e) upright and reduced and real.
(a) 30 cm to the left of the mirror.
(b) 10 cm to the right of the mirror.
(c) 6 cm to the right of the mirror
A sandwich is made from two layers of flat, transparent cladding with
index of refraction ncladding placed above and below a
flat transparent core with index of refraction ncore.
A laser beam travels through the core at an angle
θbeam with respect to the normal to the
core-cladding boundary as shown in the figure. The beam undergoes total
internal reflection at the interfaces between the cladding and the core.
If θbeam becomes too small the
beam will no longer undergo total internal reflection at the interface
between the core and the cladding.
A two-lens device is made from a convex lens with focal length
f1 = 10 cm and a concave lens with focal length
f2 = -20 cm as shown in the following figure. A
candle is placed 15 cm to the left of the convex lens. The image of the
candle formed by the first lens serves as an object for the second lens
which, in turn forms an image from this object. The lenses are 60 cm
What is the position of the image formed by the concave
(a) 45 cm to the right of the concave lens
(b) 40 cm to the left of the concave lens
(c) 20 cm to the left of the concave lens
(d) 15 cm to the right of the concave lens
(e) 12 cm to the left of the concave lens
(a) the candle's base is closer to the ceiling than is its flame -- the image is real.
(b) the candle's base is closer to the ceiling than is its flame -- the image is virtual.
(c) the candle's flame is closer to the ceiling than is its base -- the image is real.
(d) the candle's flame is closer to the ceiling than is its base -- the image is virtual.
(e) neither the flame nor the base is closer to the ceiling since the image is a point.
The eyes of a patient in need of corrective lenses are slightly
prolate so that the distance from the cornea to the retina is
greater than the focal length of the combination of the cornea and
relaxed lens, as shown in the figure. As a result, parallel rays from a
very distant object focus 25 mm from the front of the eye, even though
the retina is 27 mm from the front of the eye.
What kind of corrective lens is needed to allow the patient to focus
on distant objects?
(a) 2 mm
(b) 52 mm
(c) 104 mm
(d) 337.5 mm
(e) 675 mm
Two slits spaced by 0.3 mm are placed 50
cm away from a screen. The slits are illuminated with light
whose wavelength is 600 nm.
What is the distance between second and third dark lines of the
(a) 2 mm
(b) 0.3 mm
(c) 1 mm
(d) 0.2 mm
(e) 0.5 mm
(a) The distance between two consecutive main maxima would increase.
(b) The distance between two consecutive main maxima would decrease.
(c) This will not affect the distance between twoconsecutive main maxima.
(b) 5 I2
(c) 25 I2
A laser printer creates an image by printing small but discrete dots
on a page. If the printer used only red ink ( λ = 600
nm), how small would the spacing between dots have to be, in units
of dpi (dots per inch; 1 in. = 2.54 cm), for the image to look
smooth? Assume your eyes are 25 cm from the page and that your
pupil is round and is 2.0 mm in diameter.
(a) 556 dpi
(b) 1200 dpi
(c) 278 dpi
(d) 139 dpi
(e) 1110 dpi
(a) The spacing between dots would have to be smaller.
(b) The spacing between dots could be larger.
(c) The needed spacing would not change.
An interference maximum for the scattering of a beam of X-rays of
wavelength 0.156 nm occurs when the angle
θ between the beam and the surface of the crystal is
12.8°. The maximum is due to scattering from the
atoms in planes parallel to the crystal surface. Assuming that it is a
first order maximum, determine the interplanar spacing,
(a) 0.704 nm
(b) 0.352 nm
(c) 0.532 nm
(a) This results in an increase in the angle θ.
(b) This results in a decrease in the angle θ.
(c) This will not affect θ.
Light of wavelength 600nm is incident on a long, narrow
slit of width w, as shown in diagram (a). This slit
produces a diffraction pattern on a screen 1 m away, as
illustrated in diagram (b).
What is the width of the slit?
(a) 0.6 μm
(b) 1.2 μm
(c) 1.8 μm
(d) 2.4 μm
(e) 3.0 μm
(a) It would shift to a larger angle.
(b) It would shift to a smaller angle.
(c) The position of the minimum would not change.