Download Waves, Sound and Light Review Sheet

Physics I Honors
Name ____________________________ Date ____________
Waves, Sound and Light Review Sheet
1. If  is the wavelength of a string with a fundamental standing wave, then the distance between two
adjacent nodes is equal to
a) 1/4 
b) 1/2 
c) 
d) 2 
e) 4 
2. If the frequency of a wave source is 5 Hz and the wave speed is 10 m/s, then the distance between
successive wave crests is
a) 1 m
b) 2 m
c) 5 m
d) 10 m
e) 50 m
3. A wave leaves one medium in which it travels 6 m/s and has a wavelength of 2 m and enters a second
medium in which the wavelength is 3 m. The wave speed in the second wave is
a) 1.5 m/s
b) 5 m/s
c) 6 m/s
d) 9 m/s
e) 18 m/s
4. For waves of frequency, f , wavelength,  , and velocity, v , propagated in a certain medium, if the
frequency is doubled, then
a)  is doubled and v remains the same.
b)  is doubled and v is halved.
c)  is the same and v is doubled.
d)  is the same and v is halved.
e)  is halved and v is the same.
5. If a segment, the distance between two nodes in a standing wave, is 20 cm long, the wavelength of the
original traveling wave used to create the standing wave is
a) 10 cm
b) 20 cm
c) 30 cm
d) 40 cm
e) 50 cm
6. The frequency of infrared radiation is less than all of the following EXCEPT
a) visible light
b) radio waves
c) ultraviolet waves
d) X-rays
e) gamma rays
7.
a)
c)
e)
A train sounds its horn and moves at constant speed toward a stationary listener. The listener will hear
the pitch gradually gets higher.
b) a constant higher pitch.
the same pitch as the train engineer.
d) a constant lower pitch.
the pitch gradually getting lower.
8. A transverse wave
a) moves the medium perpendicular to the wave.
b) moves the medium parallel to the wave.
c) transmits sound.
d) Both a and c.
e) Both b and c.
9. One effect on an organ is produced by tuning two pipes to very similar pitches. If one pipe is tuned
to 440 Hz and another pipe is tuned to 442 Hz and they are played together, the effect produced is
a) a fundamental tone of 882 Hz.
b) a fundamental tone of 2 Hz.
c) an increase the intensity of the sound by a power of 4.
d) a variation of loudness of the pitch heard at a frequency of 2 Hz.
e) a destructive interference pattern that will nullify the sound the whole time they are being played.
10. When two tuning forks are sounded a beat frequency of 3 beats per second is heard. If one of the
tuning forks is middle C (262 Hz), the other fork must be
a) 87.3 Hz
b) 259 Hz
c) 265 Hz
d) 786 Hz
e) Either b and c
Questions 11 - 14 refer to the following figures.
WAVE A
Direction of
Vibration
Direction of
Motion
WAVE B
Direction of
Vibration
11. Wave A is known as a
a) torsional wave.
b) circular wave.
d) transverse wave.
e) standing wave.
c) longitudinal wave.
12. The wavelength of wave A is
a) equal to the wavelength of wave B.
c) one-half the wavelength of wave B.
e) Cannot be determined from the figures.
b) twice the wavelength of wave B.
d) four times the wavelength of wave B.
13. If the wavelength of wave B is doubled and its velocity remains constant, its period T will
a) remain constant.
b) double.
c) decrease by 1/2.
d) increases by 4 times.
e) None of the above.
14. A sound wave traveling through air is best described by wave A. The dark regions in the
wave are called
a) rarefactions.
b) compressions .
c) interference.
d) sound bands.
e) ripples.
Questions 15 and 16 refer to the following diagram.
2 meters
A standing wave of frequency 5 Hz is set up on a string 2 meters long with nodes at both ends and in the
center, as shown above.
15. The speed at which waves propagate on the string is
a) 0.4 m/s
b) 2.5 m/s
c) 5 m/s
d) 10 m/s
e) 20 m/s
16. The fundamental frequency of vibration of the string is
a) 1 Hz
b) 2.5 Hz
c) 5 Hz
d) 7.5 Hz
e) 10 Hz

P

Q
17. The figure above shows two wave pulses that are approaching each other. Which of the following best
shows the shape of the resultant pulse when the centers of the pulses, point P and Q, coincide?
a)
b)
d)
e)
c)
18. In the Doppler effect for sound waves, factors that affect the frequency that the observer hears include
which of the following?
I. The speed of the source
II. The speed of the observer
III. The loudness of the sound
a) I only
b) III only
c) I and II only
d) II and III only
e) I, II, and III
19. Which is NOT true of a longitudinal wave?
a) Displaces the medium parallel to the wave velocity
c) Has a series of compressions and rarefactions
e) May interfere with other longitudinal waves
b) Transmits sound
d) Can be seen by plucking a guitar string
Questions 20 - 22 refer to the following five wave diagrams.
I.
II.
IV.
V.
III.
20. An example of destructive interference by adding I + II is
a) I.
b) II.
c) III.
d) IV.
e) V.
21. The superposition of II + II would look most like
a) I.
b) II.
c) III.
d) IV.
e) V.
22. The superposition of V + I would look most like
a) I.
b) II.
c) III.
d) IV.
e) V.
23. If the speed of light in a vacuum is c, then the speed of light in a medium with an index of refraction
of 2 will be
a) c/2
b) 2c
c) c/4
d) 4c
e) 8c
24. Images produced by a plane mirror are
a) virtual, erect, and the same size.
b) virtual, inverted, and larger.
c) virtual, inverted, and smaller.
d) real, inverted, and larger.
e) real, erect, and smaller.
Questions 25 and 26 use the following table of refraction indices.
1.
2.
3.
4.
5.
Air
Water
Glass
Oil
Diamond
n = 1.00
n = 1.22
n = 1.50
n = 2.00
n = 2.40
25. A ray of light passes through air, glass, and then water. Select the answer that best describes what
happens to the velocity of the ray of light shown as it passes from air into glass and then out of the glass
into water.
a) Decreases, then increases
b) Decreases, then decreases again
c) Increases, then decreases
d) Increases, then increases again
e) No change
26. If the velocity of light in air is 3 x 10 8 m/sec, its velocity in glass would be approximately
a) 3 x 108 m/sec.
b) 4.5 x 108 m/sec.
c) 2 x 108 m/sec.
8
d) 6 x 10 m/sec.
e) Cannot be determined.
27. As a person moves closer to a plane mirror, the size of the image formed by the mirror
a) remains the same.
b) gets larger.
c) gets smaller.
d) increases, then decreases.
e) cannot be determined from the information given.
28. Which of the following can be used alone to form a real image?
a) Concave lens
b) Convex mirror
c) Convex lens
e) All of the above can be used.
d) Plane mirror
29. Refraction occurs when a wave
a) enters normal to a new medium. b) bounces back on itself.
c) bends around a barrier d) runs into another wave e) changes speed at a boundary of a new medium
30. In order for total internal reflection to occur,
a) light must originate in the medium of lower index of refraction.
b) light must originate in the medium in which light travels fastest.
c) light must be at an angle less than the critical angle.
d) light must be at an angle greater than or equal to the critical angle.
e) light must be perpendicular to the boundaries of the mediums.
31. When an object is between the focal point and a concave mirror the image is
a) virtual
b) inverted
c) reduced in size
d) located in front of the mirror
e) located at the focus
32. As the electromagnetic spectrum extends from radio waves to cosmic rays, which of the following
correctly describes the way in which wavelength, frequency and photon energy change?
Wavelength
Frequency
Photon Energy
a)
decreases
decreases
increases
b)
decreases
increases
increases
c)
increases
decreases
decreases
d)
increases
decreases
increases
e)
increases
increases
increases
X
Medium 1
Medium 2
Y
33. Light leaves a source at X and travels to Y along the path shown above. Which of the following
statements is correct?
a) The index of refraction is the same for the two media.
b) Light travels faster in medium 2 than in medium 1.
c) Snell’s law breaks down at the interface between the media.
d) The angle that the ray enters from X must be a critical angle.
e) Light leaving a source at Y and traveling to X would follow the same path shown above, but in reverse
A
B
C
D
Object 
E
Mirror
34. An object is placed near a plane mirror, as shown above. Which of the labeled points is the position of
the image?
a) A
b) B
c) C
d) D
e) E
35. Which ray in the diagram below best predicts the new direction of the wave in medium II, in which the
velocity of the wave is slower than in medium I?
Medium I (Fast)
E
D
A
C
B
Medium II (Slow)
36. When applied to visible light, the Doppler effect causes a light wave of a given frequency approaching
the viewer to be perceived by objective instruments as being
a) bluer
b) redder
c) darker
d) brighter
e) faster
37. The index of refraction for an unknown substance is 1.2 . The critical angle for total internal reflection
to occur in the substance if going from the substance to air is found by
a) sin (1.2) = 
b) sin (.83) = 
c) sin  = 1.2
d) sin  = .83
e) 1/sin (1.2) = 
38. A postage stamp is placed 30 cm to the left of a converging lens of focal length 60 cm. Where is the
image of the stamp located?
a) 60 cm to the left of the lens.
b) 20 cm to the left of the lens.
c) 20 cm to the right of the lens.
d) 30 cm to the right of the lens.
e) 60 cm to the right of the lens.
39. What would best describe the image of an object 18 cm in front of a concave mirror with a focal length
of 15 cm?
a) Real, inverted, reduced
b) Real, inverted, same size
c) Real, inverted, enlarged
d) Virtual, erect, enlarged
e) Virtual, erect, reduced
40. What would best describe the image of an object placed 10 cm in front of a concave lens of focal
length of 15 cm?
a) Real, inverted, reduced
b) Real, inverted, same size
c) Real, inverted, enlarged
d) Virtual, erect, enlarged
e) Virtual, erect, reduced
1. B
2. B
3. D
4. E
5. D
6. B
7. B
8. A
9. D
10. E
11. C
12. A
13. B
14. B
15. D
16. B
17. A
18. C
19. D
20. C
21. E
22. B
23. A
24. A
25. A
26. C
27. A
28. C
29. E
30. D
31. A
32. B
33. E
34. E
35. B
36. A
37. D
38. A
39. C
40. E