To The Physics Classroom

 

To the Multimedia Physics Studios

 

To the Review Session

 

To the Project Corner

 

To The Laboratory

 

To the Course Calendars

 

 

Unit 12 Quiz#1

Equations:

v = f x w

f = 1/T

v = d/t

v = 331 + .60 T

 

Multiple Choice:

1. When two waves meet along the same medium, _____________ occurs.

  1. interference
  2. refraction
  3. dispersion
  4. reflection


Useful Web Links

Reflection, Refraction, and Diffraction (9 seconds)

 

2. A sound wave is different than a light wave in that a sound wave is

  1. produced by an oscillating object and a light wave is not.
  2. not capable of traveling through a vacuum.
  3. not capable of diffracting and a light wave is.
  4. capable of existing with a variety of frequencies and a light wave has a single frequency.


Useful Web Links

Sound is a Mechanical Wave (13 seconds)

Sound is a Longitudinal Wave (9 seconds)

Sound is a Pressure Wave (12 seconds)

 

3. The "buzz" of a mosquito produces an intensity having a 40-dB rating. How many times more intense is the sound of normal conversation if it has an intensity rating of 60-dB?

  1. 2
  2. 20
  3. 100
  4. 200
  5. 400


Useful Web Links

Intensity and the Decibel Scale (5 seconds)

 

4. The book describes a sound wave as a pressure wave; regions of high (compressions) and low pressure (rarefractions) are established as the result of the vibrations of the sound source. These compressions and rarefractions result because sound

  1. is more dense than air and thus has more inertia, causing the bunching up of sound.
  2. waves have a speed which is dependent only upon the properties of the medium.
  3. is like all waves; it is able to bend into the regions of space behind obstacles.
  4. is able to reflect off fixed ends and interfere with incident waves
  5. vibrates longitudinally; the longitudinal movement of air produces pressure fluctuations.


Useful Web Links

Sound is a Pressure Wave (12 seconds)

 

5. An open-end resonance tube sounds out a fifth harmonic at 1600 Hz. The frequency of the third harmonic is

  1. 320 Hz
  2. 533 Hz
  3. 960 Hz
  4. 1600 Hz
  5. 2667 Hz


Useful Web Links

Fundamental Frequency and Harmonics (12 seconds)

Closed-End Air Columns (21 seconds)

 

6. By definition, the fundamental frequency is

  1. the lowest possible frequency an instrument can play.
  2. the lowest frequency which a human ear can hear.
  3. the frequency associated with the threshold of hearing.
  4. a frequency in the lowest octave of the musical scales.


Useful Web Links

Fundamental Frequency and Harmonics (12 seconds)

 

7. Two notes which have a frequency ratio of 2:1 are said to be separated by an octave. A note which is separated by an octave from middle C (256 Hz) is

  1. 128 Hz
  2. 254 Hz
  3. 258 Hz
  4. 345 Hz
  5. none of these

 

8. The pitch of a sound refers to the __________ of the sound wave.

  1. amplitude
  2. wavelength
  3. frequency
  4. deciBel
  5. speed


Useful Web Links

Pitch of Sound (7 seconds)

 

9. As the amplitude of a sound wave increases, the energy transported by the wave

  1. decreases
  2. increases
  3. remains the same


Useful Web Links

Intensity and the Decibel Scale (5 seconds)

 

10. Sound waves are known to exhibit the Doppler effect. This means that

  1. the frequency of any harmonic is a multiple of the first harmonic.
  2. the speed of sound waves is dependent only upon the properties of the medium.
  3. the amplitude decreases with time.
  4. sound waves can force other objects into vibrating at their natural frequency.
  5. the perceived pitch from a moving source is different than the actual frequency.


Useful Web Links

The Doppler Effect and Shock Waves (9 seconds)

 

11. Doubling the frequency of a wave source doubles the speed of the waves.

  1. True
  2. False


Useful Web Links

The Speed of Sound (6 seconds)

 

Consider the standing wave pattern below in answering this next three questions.

 

12. This standing wave pattern represents the _____ harmonic.

  1. fourth
  2. seventh
  3. eighth
  4. sixteenth


Useful Web Links

Standing Wave Patterns (9 seconds)

 

13. The number of nodes in the entire pattern is

  1. 7
  2. 8
  3. 9
  4. 16


Useful Web Links

Nodes and Anti-nodes (8 seconds)

 

14. Destructive interference occurs at point(s)

  1. B, C, and D
  2. A, E, and F
  3. A only
  4. C only
  5. all points


Useful Web Links

Nodes and Anti-nodes (8 seconds)

 

 

15. A 120-cm closed end resonance tube resonates with the frequency of the fifth harmonic. The wavelength of the fifth harmonic is

  1. 24 cm
  2. 48 cm
  3. 96 cm
  4. 150 cm
  5. 300 cm


Useful Web Links

Fundamental Frequency and Harmonics (12 seconds)

Closed-End Air Columns (21 seconds)

 

 

Two speakers are arranged so that sound waves with the same frequency are produced and radiate through the room. An interference pattern is created (as represented in the diagram below). The thick lines in the diagram represent wave crests and the thin lines represent wave troughs. Use the diagram to answer the next four questions.

15. Which two points are located on the same nodal line?

  1. A and B
  2. D and E
  3. C and F
  4. E and A


Useful Web Links

Interference and Beats (21 seconds)

Two Point Source Interference Patterns (14 seconds)

 

16. Which two points are located on the same nodal line?

  1. A and B
  2. D and E
  3. C and F
  4. E and A


Useful Web Links

Interference and Beats (21 seconds)

Two Point Source Interference Patterns (14 seconds)

 

17. At which point(s) would constructive interference occur?

  1. B only
  2. A, B, and C
  3. D, E, and F
  4. A and B


Useful Web Links

Nodes and Anti-nodes (8 seconds)

 

18. How many of the six labeled points represent anti-nodes?

  1. 1
  2. 2
  3. 3
  4. 4
  5. 6


Useful Web Links

Nodes and Anti-nodes (8 seconds)

 

 

19. The time required for the waves (v = 340 m/s) to travel from the tuning fork to point P is

  1. 0.020 sec.
  2. 0.059 sec.
  3. 0.59 sec.
  4. 2.9 sec.


Useful Web Links

The Speed of Sound (6 seconds)

 

 

Problem-Solving and Short Answer

20. Microwaves are electromagnetic waves which travel through space at a speed of 3.0 x 108 meters/sec. Most microwave ovens operate at a frequency of 2450 MHz (NOTE: 1 MHz = 1 x 106 Hz). Determine the wavelength of these microwaves. PSYW


Useful Web Links

The Speed of Sound (6 seconds)

 

21. Miles Tugo is camping in Glacier National Park. In the midst of a glacier canyon, he makes a loud hollar. He hears an echo 2.0 seconds later. The air temperature is 20-degrees C. How far away are the canyon walls. PSYW


Useful Web Links

The Speed of Sound (6 seconds)

 

22. A guitar string has a set of natural frequencies. Calculate at least three values of the set for a 60.0-cm guitar string. Assume the speed of a wave in the metal string is 480 m/s. PSYW


Useful Web Links

Guitar Strings (8 seconds)

 

 

| Sample Quizzes | Studying Suggestions | About the Quiz Room | Archive of 1997 Studying Suggestions | Archive of 1998 Studying Suggestions | Other Glenbrook South Physics Resources |

 

Special thanks to lab assistant Carl Bobis for his assistance in converting quiz to HTML format.

 

© Tom Henderson, 1996-1998


Glenbrook South High School.

Last updated on 10/2/98.