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Unit 11 Quiz#1

Directions:

This quiz is rather lengthy. If you get stuck on a section, proceed to he next section. Use complete sentences where appropriate and when a calculation is involved, please show your work.

Part I: Matching

Indicate which wave characteristic the following statements refer to by placing a letter in each blank.

f = frequency

w = wavelength

A = amplitude

T = period

v = velocity

______ (1) May be expressed in units of Hz.

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

______ (3) Equals f x w

______ (4) Reciprocal of the frequency.

______ (5) Indicator of the amount of energy in a wave.

______ (6) Depends only upon the medium through which a wave is traveling.

______ (7) Horizontal distance between adjacent troughs.

______ (8) Maximum displacement 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)

 

Part II: Fill in the Blank

Read the following paragraph and select the appropriate word to fill in the blank.

When a wave reaches a boundary between two medium, part of the wave is reflected and part of the wave is transmitted. The amount of reflection which occurs ________________ (increases, decreases) as the similarity of the two medium increases. The more similar the two medium, the ___________________ (greater, smaller) that the amplitude of the reflected wave will be. The reflected wave may be inverted or erect depending upon the relative _____________________ (rigidity, compressibility, propensity) of the two medium. When a wave travels along a slinky towards a wall, the reflected wave will be _________________ (inverted, erect). When a wave travels from a slinky to a string, the reflected wave will be _______________ (inverted, erect). When a wave is transmitted through a boundary, its speed _________________ (changes, remains the same) and its frequency _________________ (changes, remains the same). As the wave enters the new medium, the amplitude will _____________ (always, never, occasionally) increase.


Useful Web Links

Boundary Behavior (14 seconds)

Fixed End Reflection Animation

Free End Reflection Animation

Useful Boundary Behavior Animation

 

Part III: Multiple Choice

1. An ocean wave has an amplitude of 2.5 m. Weather conditions suddenly change such that the wave has an amplitude of 5.0 m. The amount of energy transported by the wave is __________.

  1. halved
  2. doubled
  3. quadrupled
  4. remains the same


Useful Web Links

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

 

2. A sound wave, traveling through water, has a frequency of 220 Hz. If another sound wave is generated with a frequency of 440 Hz, the new sound wave will have a wavelength which is ______________ the distance of the former wave.

  1. half
  2. twice
  3. quadruple


Useful Web Links

The Speed of a Wave (10 seconds)

 

3. 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 velocity of wave B must be __________ the velocity 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)

 

4. 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 frequency of wave B must be __________ the frequency 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)

 

5. Two waves are traveling through a container of nitrogen gas. Wave A has an amplitude of .1 cm. Wave B has an amplitude of .2 cm. The energy transported by wave B must be __________ the energy transported by wave A.

  1. one-fourth
  2. one-half
  3. two times larger than
  4. four times larger than


Useful Web Links

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

 

6. A fly flaps its wings back and forth 150 times every second. The period of a wing flap is ________ sec.

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


Useful Web Links

Frequency and Period of a Wave (11 seconds)

 

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

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


Useful Web Links

Frequency and Period of a Wave (11 seconds)

 

8. A tennis coach paces back and forth along the sideline 10 times in 2 minutes. The period of his pacing is ________ seconds.

  1. 120
  2. 12
  3. 5
  4. .0.20


Useful Web Links

Frequency and Period of a Wave (11 seconds)

 

Part IV: Short Answer and Problem-Solving

1. When two waves meet along the same medium, ________________ (interference, refraction, dispersion) occurs.


Useful Web Links

Interference of Waves (14 seconds)

 

2. Use the principle of superposition to determine the wave which results from the combination of the two waves in the following diagram.


Useful Web Links

Interference of Waves (14 seconds)

 

3. Consider two waves traveling through air. One has a frequency of 750 waves/sec while the other has a frequency of 250 waves/sec. Which wave travels fastest? Explain using complete sentences.


Useful Web Links

The Speed of a Wave (10 seconds)

 

4. If the speed of sound is 340 m/sec and the wavelength of a sound is 5.0 m, what is the frequency of the sound?

 

If this same sound entered into water, what would be the frequency? Explain your reasoning.


Useful Web Links

The Speed of a Wave (10 seconds)

The Wave Equation (7 seconds)

 

5. 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) (2 pts.)


Useful Web Links

The Wave Equation (7 seconds)

 

6. A certain ocean wave has a frequency of 0.05 Hz and a wavelength of 10 meters. What is the wave's speed?


Useful Web Links

The Wave Equation (7 seconds)

 

7. A wave travels from one medium to another, and the wavelength decreases. What happens to the velocity and the frequency?


Useful Web Links

Boundary Behavior (14 seconds)

 

8. Consider the wave shown below. Using a ruler, sketch the following

  1. a wave with twice the amplitude
  2. a wave with twice the frequency
  3. a wave with twice the wavelength


Useful Web Links

Wavelength and Amplitude (6 seconds)

Frequency and Period of a Wave (11 seconds)

 

9. Sketch a slinky with two pulses traveling through it in such a manner that constructive interference will occur. Indicate the direction which each pulse is moving.


Useful Web Links

Interference of Waves (14 seconds)

 

10. Sketch a slinky with two pulses traveling through it in such a manner that destructive interference will occur. Indicate the direction which each pulse is moving.


Useful Web Links

Interference of Waves (14 seconds)

 

Part V: Boundary Behavior

Consider the following diagram. A pulse is shown incident upon a boundary between two medium. The numbers indicate the relative rigidity of the two media. Study the diagram and answer the accompanying questions.

  1. The reflected pulse in medium 1 will be ________________ (erect, inverted) because_______.
  2. The speed of the transmitted pulse will be ___________ (greater than, less than, the same as) the speed of the incident pulse.
  3. The amplitude of the incident pulse will be ___________ (greater than, less than, the same as) the amplitude of the transmitted pulse.
  4. The wavelength of the incident pulse will be ___________ (greater than, less than, the same as) the wavelength of the transmitted pulse.
  5. The frequency of the reflected pulse will be ___________ (greater than, less than, the same as) the frequency of the incident pulse.
  6. The amplitude of the the transmitted pulse compared to the amplitude of the reflected pulse would be ____________ (larger, smaller, approximately the same).
  7. If the rigidity of medium 2 was decreased to 55, the amplitude of the reflected pulse would __________ (decrease, increase, remain the same).
  8. The ___________ (reflected, incident, transmitted) pulse would have the greatest amplitude.
  9. To increase the portion of the pulse which is reflected at the boundary, the rigidity of medium 2 should be ____________ (increased, decreased, remain the same).
  10. The amplitude of the reflected pulse will be increased as the rigidity of medium 2 is ____________ (decreased, increased),


Useful Web Links

Boundary Behavior (14 seconds)

Useful Boundary Behavior Animation

 

Part VI: Zingers/Extra Credit:

1. 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 velocity of the waves.


Useful Web Links

The Wave Equation (7 seconds)

 

2. A boat 4 m long is anchored facing into the waves. The waves have a velocity of 5 m/sec. It is possible for exactly three wave crests to fit under the boat at one time.

  1. Calculate the frequency of the waves.
  2. The boat lifts anchor and moves into the waves at 6 m/sec relative to the shore. What is the speed of the waves relative to the boat?
  3. Calculate the frequency of the waves relative to the boat.

     


Useful Web Links

The Wave Equation (7 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.