# Honors Physics

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```					Name: ________________________
Block: ________________________
Enriched Physics
TEST: Waves
Mr. Miller, Mr. Yuhas
May 16/17, 2006
Part I: Multiple Choice      Part II: T/F and Short Answer          Part III: Matching

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14. __________                                                      14. __________

15. __________

Part I: Multiple Choice          Part II: Short Answer              Part III: Matching
Part I TOTAL: ______ / 15        Part II TOTAL: ______/ 13          Part III TOTAL: _____ / 14

Part IV: Free Response
Question 1: __________ / 4                         Question 4: __________ / 5
Question 2: __________ / 7                         Question 5: __________ / 5
Question 3: __________ / 5                         Extra Credit: __________ / 3

Part II TOTAL: __________ / 26

ASSESSMENT SUBTOTAL: _____________________ / 68

ASSESSMENT TOTAL: _____________________ /
PART I: MULTIPLE CHOICE (1 POINT EACH)

1) As a gust of wind blows across a field of    6) How many anti-nodes does this
grain, a wave can be seen to move               standing wave have?
across the field as the tops of the plants
sway back and forth. This wave is a
a) Transverse wave
b) Longitudinal wave
c) Polarized wave
d) Interference of waves

2) The wavelength of a traveling wave is a
function of:
a) Frequency                                     a)   One
b) Velocity                                      b)   Two
c) Amplitude                                     c)   Three
d) Both choices A and B                          d)   Four

3) The diagram illustrating two waves in        7) Which of the following characteristics
phase is:                                       does a longitudinal wave possess?
a) Frequency
b) Wavelength
a)
c) Amplitude
d) All of the above.
e) None of the above.
b)
8) By what factor does the velocity on a
string change when the frequency is
c)                                             doubled? (Assume the tension remains
the same)
a) ¼
d)                                             b) ½
c) doesn’t change
4) Destructive interference occurs                 d) 2
because:                                        e) 4
a) Multiple waves combine to make a
wave of smaller amplitude                 9) A periodic wave is produced on a
b) Waves bend around or through                 stretched string. Which one of the
holes in an obstacle                         following properties is not related to the
c) Waves are absorbed and disappear             speed of the wave?
d) Two waves add up to make a wave              a) Frequency
of larger amplitude                          b) Amplitude
c) Period
5) We often hear beats (rapid alternating          d) Wavelength
between loudness and silence) when:
a) Musical notes have the same
frequency as the rhythm
b) Two notes played at the same time
have nearly the same frequency
c) Sound is created as a percussionist
hits a bass drum
d) There is interference due to multiple
echoes
10) If the frequency of a traveling wave train   Questions 14-15:
is increased by a factor of three in a       Two pulses are shown traveling in opposite
given medium, which of the following is      directions on a rope.
the result?
a) Amplitude is one third as big
b) Amplitude is tripled
c) Wavelength is one third as big
d) Wavelength is tripled
14) After one second, the crest C and
11) Sound waves are always                           trough D are at point P. Which shape
a) Transverse waves                              best represents the shape of the rope at
b) Longitudinal waves                            this time?
c) Electromagnetic waves
d) Seismic waves

12) A periodic wave travels along a
stretched string in the direction shown
15) Which best represents the shape of the
by the arrow. The sketch shows a
rope one second later (i.e., one second
“snapshot” of the pulse at a certain
after crest C and trough D were at point
instant. Points A, B, and C are on the
P)?
string. Which entry in the table below
correctly describes how the particles of
the string between A and B and B and
C are moving?

(d) none of these

between A and B      between B and C
a) Down              down
b) Up                up
c) Left              right
d) Up                down
e) Down              up

13) Which one of the following statements
concerning waves is false?
a) A wave carries energy from one
place to another.
b) A wave does not result in the bulk
flow of the material of its medium
c) A wave is a traveling disturbance.
d) A transverse wave is one in which
the disturbance is parallel to the
direction of travel.
PART II: True or False and Short Answer (13 pts)

1. T/F: A wave that is reflected from a rigid boundary undergoes a phase inversion.
2. T/F: A wave that is reflected from a non-rigid boundary undergoes a phase inversion.
3. T/F: A wave that is reflected from a rigid boundary slows down.
4. T/F: A wave that is transmitted from a denser medium to a less dense medium undergoes a phase inversion.
5. T/F: A wave that is transmitted from a less dense medium to denser medium undergoes a phase inversion.
6. In a stretched string, upon what variables does wave velocity depend?
7. What variable(s) stays the same when a wave is transmitted across a boundary?
8. When a wave enters a denser medium, what happens to its velocity?
9. When a wave enters a less dense medium, what happens to its wavelength?
10. When a wave enters a denser medium, what happens to its frequency?
11. When a wave enters a less dense medium, what happens to its amplitude?
12. What type of interference occurs when two waves meet out of phase?
13. What type of wave is shown below?

Part III: Matching (14 pts)

1. Rarefaction                      A. particles moves perpendicular to direction of wave
2. Energy                           B. occurs at a node
3. Amplitude                        C. heard when two clarinets are not in tune
4. Longitudinal wave                D. inverse of frequency
5. Beat frequency                   E. region where particles are sparsely grouped
6. Destructive interference         F. void of sound waves
7. Period                           G. particles moves in same direction as wave
8. Standing wave                    H. occurs when crest meets crest
9. Frequency                        I. part of a transverse wave
10. Constructive interference       J. transported by waves
11. Trough                          K. distance from crest to crest
12. Vacuum                          L loudness of a sound wave
13. Transverse wave                 M. stationary wave pattern
14. Wavelength                      N. determines the pitch we hear
PART IV: FREE RESPONSE
These questions are open response questions. Please show all work, including the formulas used. Be
sure to include units for all answers. Place answers in the given boxes.

PROBLEM 1 (4 Points):
A fisherman notices that wave crests pass the bow of his anchored boat every 3.0 s. He measures the
distance between two crests to be 8.5 m. How fast are the waves traveling?

v=
PROBLEM 2 (7 Points):
Transverse and longitudinal waves have many similarities yet they are different. Please describe these
two types of waves to someone who has not taken physics. In your description provide at least one
example of each type of wave. Furthermore, explain how they are different and list three similarities.

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PROBLEM 3 (5 Points):
The frequency range for a normal human ear is between 20 Hz and 20,000 Hz. Using 330 m/s as the
speed of sound,
A. Calculate the shortest wavelength of sound that can be heard.
B. Calculate the longest wavelength of sound that can be heard.

A.  =
B.  =
PROBLEM 4 (5 Points):
The displacement of a vibrating string versus position along the string is shown in the figure. The periodic
waves have a speed of 10.0 cm/s. A and B are two points on the string. (Note the quantities and units
on the axes.)

A. What is the amplitude of the wave?
B. What is the wavelength of the wave?
C. What is the frequency of the wave?

A. A =
B.  =
C. f =
PROBLEM 5 (5 Points):
The waves shown in the diagram below are square pulse waves. If wave I meets wave II, shown their
superposition on the line below.
I:
2

1.5

1

0.5

0
0   2   4   6       8       10    12        14        16        18        20

-0.5

-1

-1.5

-2

II:
2

1.5

1

0.5

0
0   2   4       6       8    10        12        14        16        18        20

-0.5

-1

-1.5

-2

Superposition:
2

1.5

1

0.5

0
0   2   4   6       8       10    12        14        16        18        20

-0.5

-1

-1.5

-2

EXTRA CREDIT (5 POINTS)
The ripples in a certain groove 12.8 cm from the center of a 33-rpm phonograph have a wavelength of
1.70 mm. What will be the frequency of the sound emitted? (Hint: rpm = rotations per minute.)

f=

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