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PHYSICS DEPARTMENT
PHY 1033
S. Obukhov
Exam #3
November 16, 2004
Name (print):
On my honor, I have neither given nor received unauthorized aid on this examination.
Signature:
YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE.
DIRECTIONS
(1) Code your test number on your pink answer sheet (use 76–80 for the 5-digit number). Code your name
on your answer sheet. Darken circles completely (errors can occur if too light). Code your UFID on your
answer sheet.
(2) Print your name on this sheet and sign it also.
(3) You may use a calculator and 1 side of handwritten 8 21 × 11 formula sheet. No other materials allowed.
(4) Do all scratch work anywhere on this exam that you like. At the end of the test, this exam printout and the formula
sheet are to be turned in. No credit will be given without both answer sheet and printout with scratch work most
questions demand.
(5) Work the questions in any order. Incorrect answers are not taken into account in any way; you may guess at answers
you don’t know if you feel that a correct answer is listed. Guessing on all questions will most likely result in failure.
(6) It is not our intention to omit the right answer, but if you believe that none of the answers is correct, please mark the
answer closest to your answer.
(7) Blacken the circle of your intended answer completely, using a number 2 pencil. Do not make any stray
marks or the answer sheet may not read properly.
(8) As an aid to the examiner (and yourself), in case of poorly marked answer sheets, please circle your selected answer
on the examination sheet.
(9) Take g=10 m/s2 and c = 3 × 108 m/s throughout this test.
(10) Good luck!!!
>>>>>>>>WHEN YOU FINISH <<<<<<<<
Hand in the pink answer sheet separately.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1. A sheet of red paper will look black when illuminated with
(1) red light.
(2) cyan light.
(3) yellow light.
(4) none of these.
(5) magenta light.
2. Complementary colors are two colors that
(1)
(2)
(3)
(4)
(5)
are additive primary colors.
are right for each other.
produce white light when added together.
are subtractive primary colors.
look good together.
3. Refraction results from differences in light’s
(1) frequency.
(2) incident angles.
(3) directions.
(4) speed.
(5) none of these.
4. An ideal Polaroid will transmit 50% of nonpolarized light incident on it. How much light is transmitted by two ideal
Polaroids that are oriented with their axes parallel to each other?
(1) between 50% and 100%
(2) 0%
(3) 100%
(4) 50%
(5) between 0% and 50%
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5. What is the wavelength of an electromagnetic wave in vacuum that has a frequency of 1 hertz?
(1) more than 1 km
(2) less than 1 km
(3) —
(4) 1 km
(5) impossible to say
6. While Earth is experiencing a total solar eclipse, an observer on the moon would see
(1)
(2)
(3)
(4)
(5)
none of these.
Earth dim and turn reddish.
Earth disappear from the sky.
a tiny dark spot move across the face of Earth.
nothing unusual.
7. Moving electric charges will interact with
A. an electric field
B. a magnetic field
(1) —
(2) A only
(3) B only
(4) A and B
(5) none of these.
8. What color light is transmitted by a piece of blue glass?
(1) white
(2) orange
(3) yellow
(4) blue
(5) red
9. If the primary of a transformer were connected to a dc power source, the transformer would have a voltage output
(1)
(2)
(3)
(4)
(5)
at a higher efficiency than with an ac source.
that is also dc.
none of these.
the same.
only while being connected or disconnected.
10. Several paper clips dangle from the north pole of a magnet. The induced pole in the bottom of the lowermost paper
clip is a
(1) south pole.
(2) —
(3) —
(4) north pole.
(5) north or south pole — no difference really.
11. Diffraction is a result of
(1) refraction.
(2) reflection.
(3) polarization.
(4) interference.
(5) dispersion.
12. The voltage across the input terminals of a transformer is 110 V. The primary has 50 loops and the secondary has 25
loops. The voltage the transformer puts out is
(1) 55 V.
(2) impossible to say.
(3) 220 V.
(4) 110 V.
(5) 25 V.
13. If you walk towards a mirror at a certain speed, the relative speed between you and your image is
(1) none of these.
(2) twice your speed.
(3) half your speed.
(4) —
(5) your speed.
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14. Different colors are dispersed by a prism because different colors in the prism have different
(1) none of these.
(2) directions.
(3) speeds.
(4) energies.
(5) frequencies.
15. Light will not pass through a pair of Polaroids when their axes are
(1) all of these.
(2) 45 degrees to each other.
(3) perpendicular.
(4) two of these.
(5) parallel.
16. The complementary color of blue is
(1) cyan.
(2) green.
(3) red.
(4) yellow.
(5) magenta.
17. When light reflects from a surface, there is a change in its
(1) frequency.
(2) wavelength.
(3) none of these.
(4) speed.
(5) —
18. If a compass is moved from the northern hemisphere to the southern hemisphere, its magnetic needle will change
direction
(1)
(2)
(3)
(4)
(5)
by 90 degrees.
depending on where the measurement is taken.
none of these.
by 180 degrees.
hardly at all.
19. If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a
(1)
(2)
(3)
(4)
(5)
wavelength of 1000 m.
speed of 1000 m/s.
period of 1000 s.
wavelength of 1000 km.
frequency of 1000 Hz.
20. Power is transmitted at high voltages because the corresponding current in the wires is
A. low so that overheating of the wires is minimized.
B. also high to deliver appreciable power to distant places.
(1) B only
(2) none of these
(3) —
(4) A and B
(5) A only