Download Unit 7 Study Guide

Name: ________________________ Class: ___________________ Date: __________
ID: A
Unit 7: PS.8 and PS.9
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
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1. A wave bending as it passes a point of land is an example of refraction. _________________________
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2. Electromagnetic waves are classified as longitudinal waves. _________________________
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3. A virtual image is formed where light rays meet at a point. _________________________
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4. Waves that require a medium through which to travel are called electromagnetic waves.
_________________________
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5. In transverse waves, the particles of the medium move at right angles to the direction in which the wave is
traveling. _________________________
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6. The speed of sound in air decreases with increasing temperature. _________________________
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7. A convex lens is thicker in the center than at its edges. _________________________
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8. Cellular telephones transmit and receive signals using high-frequency gamma rays.
_________________________
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Name: ________________________
ID: A
Short Answer
Directions: Use the diagram to answer each question.
1. What does the person transfer to the rope by pulling it up and down at point A?
2. What kind of wave is being generated?
3. In what direction does the medium move relative to the direction of the wave? Explain.
Directions: Use the diagram below to answer the questions.
4. What determines the amplitude of a wave of the type shown?
5. Name and describe the parts of the wave labeled A and B.
6. What type of mechanical wave is produced by the action of this coiled spring?
7. What is the relatinship between frequency and wavelength?
8. In electromagnetic waves, the magnetic fields are ____________________ to the electric fields.
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Name: ________________________
ID: A
9. In a longitudinal wave moving along a spring, areas where the coils are farthest apart are called
____________________.
Directions: Use the diagram to answer each question.
10. Which letter shows the type of wave that can be seen by the human eye?
11. Which letter indicates X-rays?
12. Name the type of wave labeled C.
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Name: ________________________
ID: A
Directions: Use the diagram to answer each question.
13. What type of sound waves does the sonar device produce?
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Name: ________________________
ID: A
Directions: Use the table to answer each question.
14. Explain why there is a difference between the speed of sound in air at 0°C and the speed of sound in air at
20°C.
15. In which medium listed in the table does sound travel fastest?
16. Compare the speed of sound in iron with the speed of sound in lead. Based on their relative speeds, what
might you say about the stiffness and density of iron and lead?
17. The part of the electromagnetic spectrum you can see is called ____________________ light.
18. The ____________________ of a sound wave is the distance between a compression or rarefaction and the
next compression or rarefaction.
Essay
1. Compare and contrast the properties of visible light, ultraviolet rays, and X-rays.
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Name: ________________________
ID: A
2. Describe technological applications of sound waves.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. Electromagnetic waves can transfer energy without a(n)
a. change in either a magnetic or an electric field.
b. medium.
c. electric field.
d. magnetic field.
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2. Which term refers to how high or low a sound seems to a person?
a. intensity
c. loudness
b. frequency
d. pitch
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3. The maximum distance that the particles of a medium move from the rest position is the
a. amplitude of the wave.
c. speed of the wave.
b. wavelength of the wave.
d. frequency of the wave.
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4. Mechanical waves are created when a source of energy causes a medium to
a. move.
c. vibrate.
b. compress.
d. expand.
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5. The distance between two corresponding parts of a wave is the wave’s
a. speed.
c. wavelength.
b. amplitude.
d. frequency.
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6. Why did Chuck Yeager’s team choose a high altitude to try to break the sound barrier?
a. The temperature is higher, so the speed of sound is lower.
b. The temperature is lower, so the speed of sound is higher.
c. The temperature is lower, so the speed of sound is lower.
d. The temperature is higher, so the speed of sound is higher.
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7. The interaction between two waves that meet is called
a. interference.
c. refraction.
b. diffraction.
d. reflection.
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8. The electromagnetic waves with the highest frequencies are called
a. visible light.
c. gamma rays.
b. X-rays.
d. radio waves.
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9. What occurs when vibrations traveling through an object match the object’s natural frequency?
a. diffraction
c. refraction
b. reflection
d. resonance
____ 10. Which electromagnetic waves have the longest wavelengths and lowest frequencies?
a. radio waves
c. infrared waves
b. gamma rays
d. ultraviolet rays
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Name: ________________________
ID: A
____ 11. Which waves have some electrical properties and some magnetic properties?
a. mechanical waves
c. transverse waves
b. longitudinal waves
d. electromagnetic waves
____ 12. What do some bats use to locate food and to navigate?
a. infrasound
c. echolocation
b. dissonance
d. acoustics
____ 13. Because the light rays never meet, a concave lens can produce
a. only a real image.
c. no image.
b. both real and virtual images.
d. only a virtual image.
____ 14. Doctors are able to make sonograms through the use of
a. infrasound.
c. ultrasound.
b. acoustics.
d. sonar.
____ 15. Waves that move the particles of the medium parallel to the direction in which the waves are traveling are
called
a. combination waves.
c. transverse waves.
b. surface waves.
d. longitudinal waves.
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