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Unit 11 Quiz#1

Equations:

PART I: Multiple Choice

For Questions #1-7, use the following five options to answer the questions. An option can be used more than once. Record answers on the scantron sheet.

 

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

 

1. May be expressed in units of Hz.

2. Number of waves passing by a given point per unit time.

3. Equals l/T

4. Reciprocal of the frequency.

5. Indicator of the amount of energy transported by a wave.

6. Depends only upon the properties of the medium through which a wave is traveling.

7. Maximum displacement of a particle of the medium from the rest position.


Useful Web Links

Amplitude and Wavelength (6 seconds)

Frequency and Period of a Wave (11 seconds)

Energy Transport and the Amplitude of a Wave (6 seconds)

The Speed of a Wave (10 seconds)

The Wave Equation (7 seconds)

 

For Questions #8 - 14, read the following paragraph and select the appropriate word to fill in the blank. Record answers on the scantron sheet.

 

When a wave reaches a boundary between two media, part of the wave is reflected and part of the wave is transmitted. The amount of reflection which occurs __________ (#8 a-increases, b-decreases) as the similarity of the two media increases. The reflected wave may be inverted or erect depending upon the relative __________ (#9 a-density, b-compressibility, c-propensity) of the two media. When a wave travels along a slinky towards the wall to which it is attached, the reflected wave will be _____________ (#10 a-inverted, b-erect). When a wave travels from a slinky to a light string, the reflected wave will be _______________ (#11 a-inverted, b-erect). When a wave is transmitted through (i.e., passes into ) a boundary, its speed ____________ (#12 a-changes, b-remains the same) and its frequency __________ (#13 a-changes, b-remains the same). The wavelength of a wave (whether incident or transmitted) will be _____________ (#14 a-greatest, b-smallest) in the most dense media.


Useful Web Links

Boundary Behavior (14 seconds)

Fixed End Reflection Animation

Free End Reflection Animation

Useful Boundary Behavior Animation

 

For Questions #15 - 25, choose the one best answer. Record answers on the scantron sheet.

15. A fly flaps its wings back and forth 150 times each second. The period of a wing flap is

  1. 150 sec
  2. 2.5 sec
  3. .040 sec
  4. .0067 sec


Useful Web Links

Frequency and Period of a Wave (11 seconds)

 

16. A tennis coach paces back and forth along the sideline 10 times in 2 minutes. The frequency of her pacing is ________.

  1. 5.0 Hz
  2. 0.20 Hz
  3. 0.12 Hz
  4. .083 Hz


Useful Web Links

Frequency and Period of a Wave (11 seconds)

 

17. A sound wave is a mechanical wave; not an electromagnetic wave. This means that

  1. particles of the medium move perpendicular to the direction of energy transport.
  2. a sound wave transports its energy through a vaccuum.
  3. particles of the medium regularly and repeatedly oscillate about their rest position.
  4. a medium is required in order for sound waves to transport energy.


Useful Web Links

Categories of Waves (10 seconds

 

18. Two waves are traveling through a container of nitrogen gas. Wave A has a wavelength of 1.5 m. Wave B has a wavelength of 4.5 m. The speed of wave B must be ________ the speed of wave A.

  1. one-ninth
  2. one-third
  3. the same as
  4. three times larger than


Useful Web Links

The Speed of a Wave (10 seconds)

 

19. When water waves reach an obstacle in the medium, they bend around the obstacle into the region behind it. This is evidence of the phenomenon of

  1. refraction
  2. diffraction
  3. reflection
  4. superposition


Useful Web Links

Reflection, Refraction, and Diffraction (11 seconds)

 

20. A standing wave is formed when

  1. a wave refracts due to changes in the properties of the medium.
  2. a wave reflects off a canyon wall and is heard shortly after it is formed.
  3. red, orange, and yellow wavelengths bend around suspended atmospheric particles.
  4. two identical waves moving different directions along the same medium interfere.


Useful Web Links

Formation of Standing Waves (12 seconds)

 

21. As declared by President Clinton, National Standing Wave month is the month of

  1. January
  2. February
  3. March
  4. April


Useful Web Links

** No link needed; common knowledge **

 

22. Dawn and Aram have stretched a slinky between them and begin experimenting with waves. As the frequency of the waves is doubled,

  1. the wavelength is halved and the speed remains constant
  2. the wavelength remains constant and the speed is doubled
  3. both the wavelength and the speed are halved.
  4. both the wavelength and the speed remain constant.


Useful Web Links

The Wave Equation (7 seconds)

 

23. If the energy in a longitudinal wave travels from south to north, the particles of the medium move

  1. from north to south, only.
  2. both north and south.
  3. from east to west, only.
  4. both east and west.


Useful Web Links

Longitudinal Waves (10 seconds)

 

24. Which one of the following factors determines the pitch of a sound?

  1. the amplitude of the sound wave
  2. the distance of the sound wave from the source
  3. the frequency of the sound wave
  4. the phase of different parts of the sound wave
  5. the speed of the sound wave


Useful Web Links

Pitch of Sounds (7 seconds)

 

25. The number of nodes in the standing wave shown in the diagram at the right is

  1. 6
  2. 7
  3. 8
  4. 14


Useful Web Links

Nodes and Anti-nodes (8 seconds)

 

26. The antinumber of nodes in the standing wave shown in the diagram above right is

  1. 6
  2. 7
  3. 8
  4. 14


Useful Web Links

Nodes and Anti-nodes (8 seconds)

 

PART II: Short-Answer and Problem-Solving

27. Radio waves travel at the speed of light, 3.0 x 108 m/sec. What is the wavelength of a radio wave from an AM station broadcasting at a frequency of 750 kHz? (NOTE: 1 kHZ = 1000 Hz) PSYW


Useful Web Links

The Wave Equation (7 seconds)

 

28. While hiking through a canyon, Noah Formula lets out a scream. An echo (reflection of the scream off a nearby canyon wall) is heard 2.0 seconds after the scream. The speed of the sound wave in air is 345 m/s. Calculate the distance from Noah to the nearby canyon wall. PSYW


Useful Web Links

The Speed of a Wave (10 seconds)

 

29. Two boats are anchored 4 meters apart. They bob up and down every 3 seconds, but when one is up the other is down. There are never any wave crests between the boats. Calculate the speed of the waves. PSYW


Useful Web Links

The Wave Equation (7 seconds)

 

30. Consider the wave shown below. In the space to the right of the diagram, sketch a wave with approximately twice the amplitude and one-half the wavelength. Use a ruler if necessary.


Useful Web Links

Wavelength of a Wave (6 seconds)

 

 

 

 

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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 9/29/98.