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 131.
The exam period was 90 minutes; the mean score was 100.7; the median was
103. Click here to see page1
page3 of the formula sheet that came with the exam.
Some helpful information:
• 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 smallest thickness t of oil would cause orange light
(λ = 590 nm) to be most strongly reflected?
(a) 97 nm
(b) 110 nm
(c) 194 nm
(d) 210 nm
(e) 220 nm
A double-slit experiment is set up as shown in the figure below.
Light from a laser illuminates a pair of slits etched in an opaque
barrier. The spacing between the slits is 3 × 10-4 m;
the distance from the barrier containing the slits to a viewing screen
is 3 m. Because of diffraction, a pattern of light and dark spots is
seen on the viewing screen. The distance from the central bright spot
to the first bright spots on either side is 4 × 10-3 m.
What is the wavelength of the laser light illuminating the pair of
(a) 200 nm
(b) 400 nm
(c) 500 nm
(d) 1.22 × 103 nm
(e) 1.07 × 104 nm
(a) increase by 100%.
(b) increase by 50%.
(c) remain unchanged.
(d) decrease by 33%.
(e) decrease by 50%.
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 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 lens?
(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.
If there was complete constructive interference at X, what is a
possible frequency of the light?
(a) 0 Hz
(b) 0.25 Hz
(c) 0.375 Hz
(d) 4 × 108 Hz
(e) 1.2 × 109 Hz
What is the final intensity of the light?
(a) 0.017 I0
(b) 0.033 I0
(c) 0.065 I0
(d) 0.188 I0
(e) 0.408 I0
A candle of height 5 cm is placed 4 cm away from a mirror. The image
of the candle appears at a distance of 7 cm behind the mirror.
What kind of mirror is being used?
(a) -4 cm
(b) -5.2 cm
(c) 7.7 cm
(d) 9.3 cm
(e) 11.5 cm
(a) 2 cm
(b) 3.4 cm
(c) 5.5 cm
(d) 6.9 cm
(e) 8.8 cm
(a) 1.06 × 10-4 V/m
(b) 0.354 V/m
(c) 120 V/m
(d) 1.45 × 102 V/m
(e) 4.34 × 103 V/m
An electromagnetic wave propagating in empty space is found to have a
maximum electric field of 40 MV/m. What is the value of the maximum
magnetic field to be found with this electric field?
(a) 1.2 × 10-3 T
(b) 0.133 T
(c) 40 T
In which phasor diagram is the instantaneous inductor voltage the
(a) less than the resonant frequency
(b) equal to the resonant frequency
(c) greater than the resonant frequency
If the voltage across the inductor is at a maximum, what is the voltage
across the capacitor?
(a) -20.7 V
(b) -9.2 V
(c) -6.51 V
(d) +9.2 V
(e) +20.7 V
(a) 13.5 cm
(b) 27 cm
(c) 54 cm
(a) 0 cm
(b) 50 cm
(c) 75 cm
(d) 90 cm
(e) 150 cm
What is the frequency of the tone if the speed of sound is 330 m/s?
(a) 2.6 kHz
(b) 1.4 kHz
(c) 1.0 kHz
(d) 800 Hz
(e) 50 Hz
(a) 7.91 V
(b) 6.06 V
(c) 3.21 V
(d) 1.12 V
(e) 0.761 V
An RLC circuit has R = 110 Ω, XL = 200
Ω and XC = 50 Ω, The circuit is supplied
with 120 V (RMS) at 60 Hz.
What is the total impedance of the circuit?
(a) 102 Ω
(b) 186 Ω
(c) 224 Ω
(d) 273 Ω
(a) 0.53 H
(b) 15 H
(c) 75 kH
(a) 90 W
(b) 156 W
(c) 262 W