Download Name: Period: _____ Date

Name: __________________________________ Pretest score: _____ / 47
Posttest score: _____ / 47
Pretest Ch 15: Sound & Light
1. ______ A “packet” or quantity of light
2. ______ Light sometimes acts like a wave and
sometimes like matter
3. ______ Light that leaves a mirrored surface
4. ______ Light that enters a mirrored surface or lens
5. ______ Measured between the incoming ray
and the normal line
6. ______ When one object vibrates it can cause another
one nearby to vibrate
7. ______ Light bounces off a surface
8. ______ The incoming angle is equal to the outgoing
angle; angle of incidence equals angle of
reflection
9. ______ All the different kinds of light energy possible
A. angle of incidence
B. angle of reflection
C. angle of refraction
D. decibels
E. diffraction
F. electromagnetic
spectrum
G. fundamental
frequency
H. harmonics
I. incident ray
J. Law of Reflection
K. light ray
L. normal
M. photon
N. pitch
O. reflected ray
P. reflection
Q. refraction
R. resonance
S. wave/particle duality
10. ______ Measured between the outgoing light ray and
the normal when using a mirror
11. ______ Light bends when it goes from one medium
to another
12. ______ Other standing waves created by a musical instrument
13. ______ Apparent bending of waves as they pass a boundary
14. ______ Unit that measures intensity of sound
15. ______ Measured between the normal and the “bent” light ray
16. ______ Drawn perpendicular to a surface as a reference
17. ______ The easiest standing wave a musical instrument can make
18. ______ A line used to model what a light wave does
19. ______ How high or low a musical note is
20. - 21. What happens to pitch as you decrease the tension on a string? Explain.
22. – 23. What happens to pitch as you decrease the length of a string? Explain.
24 – 25. What happens to pitch as you increase the length of a tube? Explain.
26 - 27. What happens to pitch when you close the tube? Explain.
The pictures below represent an open-ended pipe, closed-ended pipe, and a string
respectively. For each drawing, sketch in the simplest possible standing wave
that could exist.
28.
29.
30.
Here is a sound wave pattern. Figure out the following, using a ruler if
necessary.
31. _______ frequency
_______ amplitude
32. _______ wavelength
_______ wave speed
33. _____________________ An organ pipe, closed at one end, is 2.5 m long. If the
speed of sound is 345 m/s, what fundamental
frequency of will be made in such a pipe? Remember
that closed pipes make standing waves with a
wavelength of 1/4.
34. _____________________ An organ pipe, an open ended tube, has a length of 3 m.
What frequency would be produced by this pipe if the
speed of sound is 345 m/s? Remember that closed
pipes make standing waves with a wavelength of 1/2.
Use the diagram below of a ray of light striking a mirror to answer the following
questions.
A
C
B
E
D
F
G
H
35. _______ Which letter represents the angle of incidence?
36. _______ Which letter represents the angle of reflection?
37. _______ Which letter represents the mirror?
38. _______ Which letter represents the normal line?
39. _______ Which letter represents the incident ray?
40. _______ Which letter represents the reflected ray?
41. Rearrange the portions of the electromagnetic spectrum so that they are listed in
order from longest to shortest wavelength.
X-ray
Visible
light
Gamma
Radio
Microwaves Ultraviolet
Longest
42. Is the light ray in the picture at the right
entering a more or less dense medium? How
do you know?
On the picture to the right, label the following
items:
43. angle of incidence
44. angle of refraction
45. normal line
46. incident ray
47. refracted ray
Infrared
Shortest
Answer Key__
Name: _
Period: _____ Date: _____________________
Pretest Ch 15: Sound & Light
M___ A “packet” or quantity of light
1. __
S___ Light sometimes acts like a wave and
2. __
sometimes like matter
O___ Light that leaves a mirrored surface
3. __
I
4. ___ __ Light that enters a mirrored surface or lens
A__ Measured between the incoming ray
5. ___
A. angle of incidence
B. angle of reflection
C. angle of refraction
D. decibels
E. diffraction
F. electromagnetic
spectrum
G. fundamental
and the normal line
frequency
H. harmonics
one nearby to vibrate
I. incident ray
J. Law of Reflection
R___ When one object vibrates it can cause another
6. ___
P__ Light bounces off a surface
7. ___
J___ The incoming angle is equal to the outgoing
8. __
angle; angle of incidence equals angle of
reflection
F__ All the different kinds of light energy possible
9. ____
B___ Measured between the outgoing light ray and
10. ___
the normal when using a mirror
Q___ Light bends when it goes from one medium
K. light ray
L. normal
M. photon
N. pitch
O. reflected ray
P. reflection
Q. refraction
R. resonance
S. wave/particle duality
11. ___
to another
H___ Other standing waves created by a musical instrument
12. ___
E___ Apparent bending of waves as they pass a boundary
13. ___
D___ Unit that measures intensity of sound
14. ___
C___ Measured between the normal and the “bent” light ray
15. ___
L___ Drawn perpendicular to a surface as a reference
16. ___
G___ The easiest standing wave a musical instrument can make
17. ___
K___ A line used to model what a light wave does
18. ___
N___ How high or low a musical note is
19. ___
20. - 21. What happens to pitch as you decrease the tension on a string? Explain.
Decreases…changed the medium to a less
dense one…waves travel slower
22. – 23. What happens to pitch as you decrease the length of a string? Explain.
Increases…higher frequency, from shorter
wavelength
24 – 25. What happens to pitch as you increase the length of a tube? Explain.
Decreases…longer wavelength
26 - 27. What happens to pitch when you close the tube? Explain.
Decreases…longer wavelength
The pictures below represent an open-ended pipe, closed-ended pipe, and a string
respectively. For each drawing, sketch in the simplest possible standing wave
that could exist.
28.
30.
29.
Here is a sound wave pattern. Figure out the following, using a ruler if
necessary.
480 Hz
31. _
_
frequency (24 cycles in
.05 seconds)
5mm
_
_
amplitude (used ruler)
4mm_ wavelength (used ruler)
32. _
1920mm/s_ wave speed (4 x 480)1.92 m/s
_
35 Hz__ An organ pipe, closed at one end, is 2.5 m long.
33. ___
If the
speed of sound is 345 m/s, what fundamental
frequency of will be made in such a pipe? Remember
that closed pipes make standing waves with a
wavelength of 1/4.
=f
345 = f (10)
= 2.5 x 4
f = 34.5 Hz
60 Hz___ An organ pipe, an open ended tube, has a length of 3 m.
34. __
=f
= 3 x 2
What frequency would be produced by this pipe if the
speed of sound is 345 m/s? Remember that closed
pipes make standing waves with a wavelength of 1/2.
345 = f (6)
f = 57.5 Hz
Use the diagram below of a ray of light striking a mirror to answer the following
questions.
A
C
B
E
F
D
G
H
E____ Which letter represents the angle of incidence?
35. __
F____ Which letter represents the angle of reflection?
36. __
H___ Which letter represents the mirror?
37. ___
A___ Which letter represents the normal line?
38. ___
C___ Which letter represents the incident ray?
39. ____
B___ Which letter represents the reflected ray?
40. ___
41. Rearrange the portions of the electromagnetic spectrum so that they are listed in
order from longest to shortest wavelength.
X-ray
Longest
Radio
Visible light
Gamma
Microwaves Infrared
Radio
Microwaves Ultraviolet
Visible
light
Ultraviolet
X-ray
Infrared
Shortest
Gamma
42. Is the light ray in the picture at the right
entering a more or less dense medium? How do you know?
More…the light is bending
toward the normal
On the picture to the right, label the following
items:
43. angle of incidence
44. angle of refraction
45. normal line
46. incident ray
47. refracted ray
45.
46.
43.
44.
47.