Physics: Principles with Applications, Sixth Edition
33) For a wave, the frequency times the wavelength is the wave's
A) speed.
B) amplitude.
C) intensity.
D) power.
Answer: A
Diff: 1 Page Ref: Sec. 11.7-11.8
34) The frequency of a wave increases. What happens to the distance between successive crests if
the speed remains constant?
A) It increases.
B) It remains the same.
C) It decreases.
D) It cannot be determined from the information given.
Answer: C
Diff: 1 Page Ref: Sec. 11.7-11.8
35) A wave moves on a string with wavelength l and frequency f. A second wave on the same
string has wavelength 2l and travels with the same velocity. What is the frequency of the
second wave?
A) 0.5f
B) f
C) 2f
D) It cannot be determined from the information given.
Answer: A
Diff: 1 Page Ref: Sec. 11.7-11.8
36) Consider a traveling wave on a string of length L, mass M, and tension T. A standing wave is
set up. Which of the following is true?
A) The wave velocity depends on M, L, T.
B) The wavelength of the wave is proportional to the frequency.
C) The particle velocity is equal to the wave velocity.
D) The wavelength is proportional to T.
Answer: A
Diff: 2 Page Ref: Sec. 11.7-11.8
207
,Chapter 11: Vibrations and Waves
37) A string of mass m and length L is under tension T. The speed of a wave in the string is v.
What will be the speed of a wave in the string if the mass of the string is increased to 2m, with
no change in length?
A) 0.5v
B) 0.71v
C) 1.4v
D) 2v
Answer: B
Diff: 1 Page Ref: Sec. 11.7-11.8
38) A string of mass m and length L is under tension T. The speed of a wave in the string is v.
What will be the speed of a wave in the string if the length is increased to 2L, with no change
in mass?
A) 0.5v
B) 0.71v
C) 1.4v
D) 2v
Answer: C
Diff: 1 Page Ref: Sec. 11-7-11.8
39) A string of mass m and length L is under tension T. The speed of a wave in the string is v.
What will be the speed of a wave in the string if the tension is increased to 2T?
A) 0.5T
B) 0.71T
C) 1.4T
D) 2T
Answer: C
Diff: 2 Page Ref: Sec. 11.7-11.8
40) In seismology, the S wave is a transverse wave. As an S wave travels through the Earth, the
relative motion between the S wave and the particles is
A) parallel.
B) perpendicular.
C) first parallel, then perpendicular.
D) first perpendicular, then parallel.
Answer: B
Diff: 1 Page Ref: Sec. 11.7-11.8
208
, Physics: Principles with Applications, Sixth Edition
41) In seismology, the P wave is a longitudinal wave. As a P wave travels through the Earth, the
relative motion between the P wave and the particles is
A) parallel.
B) perpendicular.
C) first parallel, then perpendicular.
D) first perpendicular, then parallel.
Answer: A
Diff: 1 Page Ref: Sec. 11.7-11.8
42) The intensity of a wave is
A) proportional to both the amplitude squared and the frequency squared
B) proportional to the amplitude squared and inversely proportional to the frequency
squared.
C) inversely proportional to the amplitude squared and proportional to the frequency
squared.
D) inversely proportional to both the amplitude squared and the frequency squared.
Answer: A
Diff: 1 Page Ref: Sec. 11.9-11.10
43) A wave pulse traveling to the right along a thin cord reaches a discontinuity where the rope
becomes thicker and heavier. What is the orientation of the reflected and transmitted pulses?
A) Both are right side up.
B) The reflected pulse returns right side up while the transmitted pulse is inverted.
C) The reflected pulse returns inverted while the transmitted pulse is right side up.
D) Both are inverted.
Answer: C
Diff: 1 Page Ref: Sec. 11.11
44) Two wave pulses with equal positive amplitudes pass each other on a string, one is traveling
toward the right and the other toward the left. At the point that they occupy the same region
of space at the same time
A) constructive interference occurs.
B) destructive interference occurs.
C) a standing wave is produced.
D) a traveling wave is produced.
Answer: A
Diff: 1 Page Ref: Sec. 11-12
209
, Chapter 11: Vibrations and Waves
45) Two wave pulses pass each other on a string. The one traveling toward the right has a positive
amplitude, while the one traveling toward the left has an equal amplitude in the negative
direction. At the point that they occupy the same region of space at the same time
A) constructive interference occurs.
B) destructive interference occurs.
C) a standing wave is produced.
D) a traveling wave is produced.
Answer: B
Diff: 1 Page Ref: Sec. 11.12
46) Resonance in a system, such as a string fixed at both ends, occurs when
A) it is oscillating in simple harmonic motion.
B) its frequency is the same as the frequency of an external source.
C) its frequency is greater than the frequency of an external source.
D) its frequency is smaller than the frequency of an external source.
Answer: B
Diff: 2 Page Ref: Sec. 11.13
47) If one doubles the tension in a violin string, the fundamental frequency of that string will
increase by a factor of
A) 2.
B) 4.
C) 1.4.
D) 1.7.
Answer: C
Diff: 2 Page Ref: Sec. 11.13
Quantitative Problems
1) What is the spring constant of a spring that stretches 2.00 cm when a mass of 0.600 kg is
suspended from it?
A) 0.300 N/m
B) 30.0 N/m
C) 2.94 N/m
D) 294 N/m
Answer: D
Diff: 1 Page Ref: Sec. 11.1-11.3
210
33) For a wave, the frequency times the wavelength is the wave's
A) speed.
B) amplitude.
C) intensity.
D) power.
Answer: A
Diff: 1 Page Ref: Sec. 11.7-11.8
34) The frequency of a wave increases. What happens to the distance between successive crests if
the speed remains constant?
A) It increases.
B) It remains the same.
C) It decreases.
D) It cannot be determined from the information given.
Answer: C
Diff: 1 Page Ref: Sec. 11.7-11.8
35) A wave moves on a string with wavelength l and frequency f. A second wave on the same
string has wavelength 2l and travels with the same velocity. What is the frequency of the
second wave?
A) 0.5f
B) f
C) 2f
D) It cannot be determined from the information given.
Answer: A
Diff: 1 Page Ref: Sec. 11.7-11.8
36) Consider a traveling wave on a string of length L, mass M, and tension T. A standing wave is
set up. Which of the following is true?
A) The wave velocity depends on M, L, T.
B) The wavelength of the wave is proportional to the frequency.
C) The particle velocity is equal to the wave velocity.
D) The wavelength is proportional to T.
Answer: A
Diff: 2 Page Ref: Sec. 11.7-11.8
207
,Chapter 11: Vibrations and Waves
37) A string of mass m and length L is under tension T. The speed of a wave in the string is v.
What will be the speed of a wave in the string if the mass of the string is increased to 2m, with
no change in length?
A) 0.5v
B) 0.71v
C) 1.4v
D) 2v
Answer: B
Diff: 1 Page Ref: Sec. 11.7-11.8
38) A string of mass m and length L is under tension T. The speed of a wave in the string is v.
What will be the speed of a wave in the string if the length is increased to 2L, with no change
in mass?
A) 0.5v
B) 0.71v
C) 1.4v
D) 2v
Answer: C
Diff: 1 Page Ref: Sec. 11-7-11.8
39) A string of mass m and length L is under tension T. The speed of a wave in the string is v.
What will be the speed of a wave in the string if the tension is increased to 2T?
A) 0.5T
B) 0.71T
C) 1.4T
D) 2T
Answer: C
Diff: 2 Page Ref: Sec. 11.7-11.8
40) In seismology, the S wave is a transverse wave. As an S wave travels through the Earth, the
relative motion between the S wave and the particles is
A) parallel.
B) perpendicular.
C) first parallel, then perpendicular.
D) first perpendicular, then parallel.
Answer: B
Diff: 1 Page Ref: Sec. 11.7-11.8
208
, Physics: Principles with Applications, Sixth Edition
41) In seismology, the P wave is a longitudinal wave. As a P wave travels through the Earth, the
relative motion between the P wave and the particles is
A) parallel.
B) perpendicular.
C) first parallel, then perpendicular.
D) first perpendicular, then parallel.
Answer: A
Diff: 1 Page Ref: Sec. 11.7-11.8
42) The intensity of a wave is
A) proportional to both the amplitude squared and the frequency squared
B) proportional to the amplitude squared and inversely proportional to the frequency
squared.
C) inversely proportional to the amplitude squared and proportional to the frequency
squared.
D) inversely proportional to both the amplitude squared and the frequency squared.
Answer: A
Diff: 1 Page Ref: Sec. 11.9-11.10
43) A wave pulse traveling to the right along a thin cord reaches a discontinuity where the rope
becomes thicker and heavier. What is the orientation of the reflected and transmitted pulses?
A) Both are right side up.
B) The reflected pulse returns right side up while the transmitted pulse is inverted.
C) The reflected pulse returns inverted while the transmitted pulse is right side up.
D) Both are inverted.
Answer: C
Diff: 1 Page Ref: Sec. 11.11
44) Two wave pulses with equal positive amplitudes pass each other on a string, one is traveling
toward the right and the other toward the left. At the point that they occupy the same region
of space at the same time
A) constructive interference occurs.
B) destructive interference occurs.
C) a standing wave is produced.
D) a traveling wave is produced.
Answer: A
Diff: 1 Page Ref: Sec. 11-12
209
, Chapter 11: Vibrations and Waves
45) Two wave pulses pass each other on a string. The one traveling toward the right has a positive
amplitude, while the one traveling toward the left has an equal amplitude in the negative
direction. At the point that they occupy the same region of space at the same time
A) constructive interference occurs.
B) destructive interference occurs.
C) a standing wave is produced.
D) a traveling wave is produced.
Answer: B
Diff: 1 Page Ref: Sec. 11.12
46) Resonance in a system, such as a string fixed at both ends, occurs when
A) it is oscillating in simple harmonic motion.
B) its frequency is the same as the frequency of an external source.
C) its frequency is greater than the frequency of an external source.
D) its frequency is smaller than the frequency of an external source.
Answer: B
Diff: 2 Page Ref: Sec. 11.13
47) If one doubles the tension in a violin string, the fundamental frequency of that string will
increase by a factor of
A) 2.
B) 4.
C) 1.4.
D) 1.7.
Answer: C
Diff: 2 Page Ref: Sec. 11.13
Quantitative Problems
1) What is the spring constant of a spring that stretches 2.00 cm when a mass of 0.600 kg is
suspended from it?
A) 0.300 N/m
B) 30.0 N/m
C) 2.94 N/m
D) 294 N/m
Answer: D
Diff: 1 Page Ref: Sec. 11.1-11.3
210
