Name:______________________________Class:__________________ Date:__________________
Assessment
Vibrations and Waves
Teacher Notes and Answers
11 Vibrations and Waves
WAVE INTERACTIONS
1. a
2. d
3. c
4. d
5. b
6. d
7. c
8. a
9. If the displacements are in the same
direction (both are crests or both are
troughs), constructive interference will
occur. If the displacements are in opposite
directions (one is a crest and the other is a
trough), destructive interference will occur.
10. The boundary must be fixed; i.e. the rope
must be firmly attached to the pole, unable
to slide up and down.
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Section Quizzes
Name:______________________________Class:__________________ Date:__________________
Assessment
Vibrations and Waves
Section Quiz: Wave Interactions
Write the letter of the correct answer in the space provided
_____ 1. When two transverse waves traveling through a medium meet and
exactly coincide, the resulting displacement of the medium
a. is the sum of the displacements of each wave.
b. is zero.
c. is always greater than the displacement of either wave alone.
d. is always destructive.
_____ 2. When two waves having displacements in opposite directions meet,
_______________ occurs.
a. complete cancellation
b. no interference
c. constructive interference
d. destructive interference
_____ 3. Two waves meet and interfere constructively. Which one of the
following factors increases?
a. period
c. amplitude
b. frequency
d. wavelength
_____ 4. The diagram above represents two pulse waves moving toward each
other through a medium. The two waves will exactly coincide when
they reach point A. At point A, the amplitude of the combined waves
will be
a. twice that of either wave alone.
b. the same as either wave alone.
c. half that of either wave alone.
d. zero.
_____ 5. When a wave on a rope strikes a free boundary, the wave is
a. reflected and inverted.
c. not reflected.
b. reflected but not inverted.
d. absorbed.
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Section Quizzes
Name:______________________________Class:__________________ Date:__________________
Vibrations and Waves continued
_____ 6. A wave pattern on a stretched string appears to be stationary. This
wave pattern is an example of a
a. longitudinal wave.
b. non-periodic wave.
c. pulse wave.
d. standing wave.
_____ 7. In a standing wave on a vibrating string, a point that appears to remain
stationary is a(n)
a. antinode.
b. point of constructive interference.
c. node.
d. rarefaction
_____ 8. The diagram above represents a certain standing wave on a vibrating
string. This standing wave has
a. 4 nodes and 3 antinodes.
c. 2 nodes and 3 antinodes.
b. 3 nodes and 4 antinodes.
d. 3 nodes and 2 antinodes.
9. Two waves traveling in the same medium are approaching each other. What
determines whether constructive or destructive interference occurs when the
waves meet and coincide?
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10. A student attaches one end of a rope to a pole and then sends a pulse wave
from the opposite end of the rope. Under what conditions will the wave be
inverted when it reaches the pole and is reflected?
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Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Physics
3
Section Quizzes