1. What kind of wave does this graph represent? Transverse wave
Longitudinal wave
Electromagnetic wave
Pulse wave
Answer: A) Transverse wave

2. Which letter on the graph represents wavelength? A. A B. B C. C D. D
Answer: C) C

3. Which letter on the graph is used for a trough? A. A B. B C. C D. D
Answer: A) A

4. A wave with an amplitude of 0
A wave with an amplitude of 0.75 m has the same wavelength as a second wave with an amplitude of 0.53m. The two waves interfere.
What is the amplitude of the resultant wave if the interference is constructive?
A. 0.22m
B 0.53m
C. 0.75m
D. 1.28m
Answer: D) 1.28m

5. A wave with an amplitude of 0
A wave with an amplitude of 0.75 m has the same wavelength as a second wave with an amplitude of 0.53m. The two waves interfere.
What is the amplitude of the resultant wave if the interference is destructive?
A. 0.22m
B 0.53m
C. 0.75m
D. 1.28m
Answer: A) 0.22m

6. Two successive crests of a transverse wave 1. 20m apart
Two successive crests of a transverse wave 1.20m apart. Eight crests pass a given point 12.0s. What is the wave speed?
0.667m/s
0.800m/s
1.80m/s
9.60m/s
Answer: B) 0.800m/s

7. Green light has a wavelength of 5. 20× 10 −7 m and a speed in air of 3
Green light has a wavelength of 5.20× 10 −7 m and a speed in air of 3.00× 10 8 m/s. Calculate the frequency and the period of the light.
Answer: 5.77× Hz, 1.73× 10 −15 s

8. What kind of wave does not need a medium through which to travel?
Answer: electromagnetic waves

9. List three wavelengths that could form standing waves on a 2
List three wavelengths that could form standing waves on a 2.0 m string that is fixed at both ends.
Answer: Possible correct answers include 4.0 m, 2.0 m, 1.3 m, 1.0 m, or other wavelengths such that nL = 4.0 m (where n is a positive integer).

10. A harmonic wave is traveling along a rope
A harmonic wave is traveling along a rope. The oscillator that generates the wave completes 40.0 vibrations in 30.0 s. A given crest of the wave travels 425 cm along the rope in a period of 10.0 s. What is the wavelength? Show all of your work.
Answer: 0.319m

11. When a part of a sound wave travels from air into water, which property of the wave remains unchanged?
Speed
Frequency
Wavelength
Amplitude
Answer: B) Frequency

12. What is the wavelength of the sound wave shown in the figure?
1.00m
0.75m
0.50m
0.25m
Answer: D) 0.25m

13. If a sound seems to be getting louder, which of the following is probably increasing?
Speed of sound
Frequency
Wavelength
Intensity
Answer: D) Intensity

14. The intensity of a sound wave increases by 1000 W/m2
The intensity of a sound wave increases by 1000 W/m2. What is this increase equal to in decibels? 10 20 30 40
Answer: C) 30

15. A source of sound moves toward a listener.
The Doppler effect occurs in all but which of the following situations?
A source of sound moves toward a listener.
A listener moves toward a source of sound.
A listener and a source of sound remain at rest with respect to each other.
A listener and a source of sound move toward or away from each other.
Answer: C) A listener and a source of sound remain at rest with respect to each other.

16. If the distance from a point source of sound is tripled, by what factor is the sound intensity changed?
1/9
1/3 3 9
Answer: 1/9

17. Dogs detect sounds of less intensity than do humans.
Why can a dog hear a sound produced by a dog whistle, but its owner cannot?
Dogs detect sounds of less intensity than do humans.
Dogs detect sounds of higher frequency than do humans.
Dogs detect sounds of lower frequency than do humans.
Dogs detect sounds of higher speed than do humans.
Answer: B) Dogs detect sounds of higher frequency than do humans.

18. The greatest value ever achieved for the speed of sound in air is about 1.0× m/s, and the highest frequency ever produced is about 2.0× Hz. If a single sound wave with this speed and frequency were produced, what would its wavelength be?
5.0× 10 −6 m
5.0× 10 −7 m
2.0× 10 6 m
2.0× m
Answer: B) 5.0× 10 −7 m

19. The original sound of the horn rises in pitch
The horn of a parked automobile is stuck. If you are in a vehicle that passes the automobile, as shown in the diagram, what is the nature of the sound that you hear?
The original sound of the horn rises in pitch
The original sound of the horn drops in pitch.
A lower pitch is heard rising to a higher pitch.
A higher pitch is heard dropping to a lower pitch.
Answer: D) A higher pitch is heard dropping to a lower pitch

20. The second harmonic of a guitar string has a frequency of 165 Hz
The second harmonic of a guitar string has a frequency of 165 Hz. If the speed of waves on the string is 120 m/s, what is the string’s length?
0.36m
0.73m
1.1m
1.4m
Answer: B) 0.73m

21. Two wind instruments produce sound waves with frequencies of 440 Hz and 447 Hz, respectively. How many beats per second are heard from the superposition of the two waves?
Answer: 7 beats per second (7Hz)

22. If you blow across the open end of a soda bottle and produce a tone of 250 Hz, what will be the frequency of the next harmonic heard if you blow much harder?
Answer: 750Hz

23. The figure shows a string vibrating in the sixth harmonic
The figure shows a string vibrating in the sixth harmonic. The length of the string is 1.0 m. What is the wavelength of the wave on the string?
Answer: 0.33m

24. The power output of a certain loudspeaker is 250. 0W
The power output of a certain loudspeaker is 250.0W. If a person listening to the sound produced by the speaker is sitting 6.5m away, what is the intensity of the sound?
Answer: 0.47 W/ 𝑚 2

25. The area of a typical eardrum is approximately equal to 5.0× 10 −5 𝑚 2 .
What is the sound power (the energy per second) incident on the eardrum at the threshold of pain (1.0 W/ 𝑚 2 )?
Answer: 5.0× 10 −5 W

26. The area of a typical eardrum is approximately equal to 5.0× 10 −5 𝑚 2 .
What is the sound power (the energy per second) incident on the eardrum at the threshold of hearing (1.0× 10 −12 W/ 𝑚 2 )?
Answer: 5.0× 10 −17 W

27. A pipe that is open at both ends has a fundamental frequency of 456 Hz when the speed of sound in air is 331 m/s.
How long is the pipe?
Answer: 0.363m

28. What is the frequency of the pipe’s second harmonic?
A pipe that is open at both ends has a fundamental frequency of 456 Hz when the speed of sound in air is 331 m/s.
What is the frequency of the pipe’s second harmonic?
Answer: 912Hz

29. A pipe that is open at both ends has a fundamental frequency of 456 Hz when the speed of sound in air is 331 m/s.
What is the fundamental frequency of this pipe when the speed of sound in air is increased to 367 m/s as a result of a rise in the temperature of the air?
Answer: 509Hz