Physics 171.102
Midterm Exam 2
March 28, 2008
Answer all four problems. Be sure that you pace yourself so that you have enough time
to work on each problem. Note that the problems do not have equal weight.
Make sure that your answers are clearly marked, f
3.
The average value of sin2t for a complete cycle is
A. 1.
B. 0.
C. 0.707.
D. 0.500.
E. 0.250.
Giambattista - Chapter 21 #3
Section: 21.1 Sinusoidal Currents and Voltages
4.
A 150 W light bulb is designed for an ac voltage of 120 V rms. What is the resis
58.
What inductance is needed in series with a 4.7 F capacitor for a resonant frequency of 10
kHz?
A. 22 uH
B. 54 uH
C. 0.66 uH
D. 5.3 mH
Giambattista - Chapter 21 #58
Section: 21.6 Resonance in an RLC Circuit
59.
I the inductance and the capacitance both
19.
A ray of light enters an equilateral prism made of material with n = 1.45 at an angle of incidence
. The internally refracted ray is parallel to the base of the prism. What is the angle of refraction
for the ray leaving the prism?
A. 46.5
B. 30.0
C. 2
12.
A diver, below the surface of a lake, notices that no light appears to be coming toward her
greater than the angle , measured from the vertical. If the index of refraction of water is 1.33,
what is the angle ?
A. 30
B. 34
C. 37
D. 49
E. 54
Giambattist
23. Three lenses, each of focal length 90 cm, are placed in contact. What is the focal length of the
combination?
A. 27 cm
B. 93 cm
C. 1/30 cm
D. 45 cm
E. 30 cm
24. If an object is placed before a singe thin lens
A. real images are always enlarged.
B. vir
23. A small object is enclosed in plastic (n = 1.5). The object appears to be 4.0 cm below the surface.
What is the actual distance of the object below the surface?
A. 2.0 cm
B. 2.7 cm
C. 4.0 cm
D. 5.5 cm
E. 6.0 cm
24. A ray of light enters an equilateral
47.
Radiation of intensity 1.00 kW/m2 is incident on an area perpendicular to the incoming light.
The area is now rotated 20 about an axis perpendicular to the incoming light. What is the
resulting power per unit area now reaching the surface?
A. 1.00 kW/
41.
A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal -100 cm focal length.
Where is the image formed?
A. 80 cm behind the mirror
B. 25 cm behind the mirror
C. 17 cm behind the mirror
D. 17 cm in front of the mirror
E. 25 cm in f
32.
When light is totally polarized by reflection at an interface between two materials where the
index of refraction for the incident medium is n1 and for the other is n2, the incident angle is
given by = tan-1(n2/n1). This equation holds
A. only when n2
17. Which of the following best describes the greatest known value for index of refraction?
A. 1.732
B. 1.999. (just shy of 2)
C. 2.000. (2 exactly)
D. a value greater than 2 but not greater than 3
E. a value greater than 3
18. A ray of light enters an eq
29.
A series RLC ac circuit has a capacitive reactance of 55 , and inductive reactance of 25 ,
and a resistance of 40 . What is the impedance of this circuit?
A. 12
B. 95
C. 70
D. 10
E. 50
Giambattista - Chapter 21 #29
Section: 21.5 RLC Series Circui
59. When projected through a single lens, the image of a movie on a screen is
A. real and inverted.
B. virtual and inverted.
C. real and upright.
D. virtual and upright.
E. virtual and enlarged.
60. In order to produce an image double the size of an objec
54.
Plane polarized light of intensity I0 is sent through a polarizer rotated 45 clockwise to the
original plane of polarization and then through a second polarizer rotated 45 counter-clockwise
measured from the original plane of polarization. What is the
37. In vacuum, the components of an EM wave are Ey = 50(V/m)cos[(5.00 m-1)x + t], Ex = 0, and Ez =
0. What is ?
A. 1.50 109 rad/s
B. l.20 109 rad/s
C. 1.00 109 rad/s
D. 8.00 108 rad/s
E. more information is needed
38. In vacuum, the components of an EM wa
6. Wavelengths just shorter than visible light are classified as
A. gamma rays.
B. x-rays.
C. microwaves.
D. ultraviolet.
E. radio waves.
7. 1 THz = ?
A. 103 Hz
B. 106 Hz
C. 109 Hz
D. 1012 Hz
E. 1015 Hz
8. The longest wavelengths of visible light are in t
Physics 171.102
Midterm Exam 2
March 27, 2009
Answer all four problems. Be sure that you pace yourself so that you have enough time
to work on each problem. Note that the problems do not have equal weight.
Make sure that your answers are clearly marked, f
50.
A 25 cm focal length mirror has a 3.0 cm tall object placed 20 cm in front of it. What is the size
of the image and is it upright or inverted?
A. 1.0 cm, upright
B. 3.8 cm, inverted
C. 2.4 cm, inverted
D. 15 cm, upright
E. 12 cm, upright
Giambattista
14. Two lenses, the first with focal length -12.5 cm and the second with focal length 20.0 cm, are
separated by 15.0 cm. If an object is place 50.0 cm in front of the first lens, where is the final image
formed?
A. 10.0 cm before the first lens
B. 25.0 cm
46. For electromagnetic radiation of intensity of 1.00 W/m2, what is the rms value of the electric field?
A. 19.4 V/m
B. 9.69 V/m
C. 6.45 10-8 V/m
D. 9.11 10-8 V/m
E. 3.00 107 V/m
47. Radiation of intensity 1.00 kW/m2 is incident on an area perpendicular
25.
A ray of light enters an equilateral prism made of material with n = 1.45 at an angle of incidence
. The internally refracted ray is parallel to the base of the prism. What is the angle of refraction
for the ray leaving the prism?
A. 46.5
B. 30.0
C. 2
36.
A series LR circuit dissipates 60 W. The circuit is powered by a 120 V rms 60 Hz supply. If the
current is 2.0 A rms, what is the inductance?
A. 0.10 H
B. 0.15 H
C. 0.20 H
D. 0.25 H
E. 0.30 H
Giambattista - Chapter 21 #36
Section: 21.5 RLC Series Circ
13.
The background radiation in space corresponds to what temperature blackbody radiation?
A. 0 K
B. 2.7 K
C. 273 K
D. 5800 K
E. 98.6F
Giambattista - Chapter 22 #13
Section: 22.4 The Electromagnetic Spectrum
14.
Radio waves were discovered by
A. Hertz.
B.
50. A 25 cm focal length mirror has a 3.0 cm tall object placed 20 cm in front of it. What is the size of
the image and is it upright or inverted?
A. 1.0 cm, upright
B. 3.8 cm, inverted
C. 2.4 cm, inverted
D. 15 cm, upright
E. 12 cm, upright
51. Which of
22.
When light goes from one medium to another medium with a different index of refraction, which
of the following do (does) NOT change?
A. the speed
B. the wavelength
C. the frequency
D. the speed and the wavelength
E. the frequency and the wavelength
Gi
Section: 23.9 Thin Lenses
59.
When projected through a single lens, the image of a movie on a screen is
A. real and inverted.
B. virtual and inverted.
C. real and upright.
D. virtual and upright.
E. virtual and enlarged.
Giambattista - Chapter 23 #59
Sect
33. A person has his nearsightedness corrected by lenses of -5.00 D. Without his glasses, his near
point was 12.5 cm. With his glasses on, what is his near point? Assume the lenses are very close
to eyes.
A. 13.0 cm
B. 20.0 cm
C. 33.0 cm
D. 17.5 cm
E. 7.5
5. Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm,
are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. Where is the
image caused by the first lens? Give the most inclusi