Unit: Waves
Study Guide for Post Test KEY
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. Which of the following types of waves requires a medium?
a. visible light
c. microwaves
b. X-rays
d. sound waves
2 . If a wave is traveling at a certain speed (the exact speed does not matter right now) and its frequency is
doubled, what happens to the wavelength of that wave?
A. It’s doubled
B. It’s cut in half
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3. A wave can make a leaf bob up and down on the water, but it cannot move the leaf toward the shore. This is
because waves only transfer _________Energy________ not matter.
4. When two objects, such as marimba bars or suspension bridge cables, vibrate at the same frequency, this
occurs.
a. refraction
c. resonance
b. reflection
d. amplitude
5. If a wave is traveling at a certain speed and you cut its frequency in half, what would happen to its
wavelength?
a. The wavelength would be not halved but doubled.
b. The wavelength would produce a standing wave.
6. An echo is the result of a ____________________ sound wave.
a. reflected
____
b. diffracted
7. A section of a longitudinal wave where the particles are crowded together is called a _______________.
a. rarefaction
b. compression
____
8. When the crests of one wave overlap the crests of another wave or waves, ___________________
interference occurs.
a. constructive
____
b. destructive
9. A standing wave results from _____________________________.
a. constructive interference
b. destructive interference
____ 10. Part of a longitudinal wave where the particles are spread apart is called is called ________________.
a. rarefaction
b. compression
____ 11. What is the amplitude of a wave related to?
a. volume
b. speed
____ 12. What is this equation (v =   f) called?
a. frequency equation
b. wave equation
____ 13. What unit is used to describe the frequency of a wave?
a. decibel
b. hertz
____ 14. What happens to a wave when it is refracted?
a. It is bent.
b. It is transmitted.
____ 15. Why do sound waves travel around corners better than light waves?
a. Sound waves radiate.
b. Sound waves bend.
____ 16. Different instruments produce their own unique sound qualities because
a. each has several different pitches that mix together through interference.
b. some produce fundamental frequencies and some produce
overtones.
____ 17. What can a violinist do if one string is producing a sound that is too low?
a. lengthen the string
b. shorten the string
____ 18. Which of the following will produce a noise?
a. a car motor
b. a guitar
____ 19. The blending of pitches through interference produces an instrument’s
a. sound quality.
b. amplitude.
____ 20. Sounds with frequencies higher than 20,000 Hz
a. are considered to be noise.
b. are ultrasonic sounds.
____ 21. The motion of either the listener or the source of a sound causes
the Doppler effect.
echolocation.
____ 22. The frequency of a sound wave determines
a. the pitch of the sound.
b. the loudness of the sound.
____ 23. The medium through which sound waves travel affects the
a. speed of the sound.
b. the amplitude of the waves.
____ 24. A person experiences a sonic boom when
a. a shock wave reaches the ears.
b. an airplane breaks the sound barrier.
____ 25. Sound waves are best reflected off which surfaces?
a. bumpy, soft
c. smooth, hard
b. smooth, soft
d. bumpy, hard
____ 26. Which person will experience what happens to sounds due to the Doppler effect?
a. a father pushing a laughing toddler on a swing
b. a boy sitting and watching television
____ 27. Which of the following people is most likely to suffer from tinnitus?
a. an elderly person
b. a former rock star
____ 28. What is the speed of light in a vacuum?
a. 300,000,000 m/s
b. 3,000 m/s
____ 29. An electromagnetic wave
a. never moves.
b. can travel only through empty space.
c. cannot travel through matter.
d. can travel through empty space
or matter.
____ 30. The electromagnetic spectrum is the entire range of
a. colors of visible light.
b. EM waves.
____ 31. The electromagnetic spectrum is divided into regions by
a. wavelengths.
b. speed.
____ 32. What wave interaction occurs when waves combine and the resulting wave has a greater amplitude than the
individual waves had?
a. constructive interference
b. destructive interference
____ 33. What wave interaction occurs when waves combine and the resulting wave has a smaller amplitude than the
individual waves had?
a. constructive interference
b. destructive interference
____ 34. Whether an object is transparent, translucent, or opaque is determined by its ability to
a. refract light.
c. transmit light.
b. diffract light.
d. increase the speed of light.
____ 35. The mixing of colors of light together is called
a. color addition.
b. color subtraction.
____ 36. When pigments are mixed the result is called
a. color addition.
c. color absorption.
b. color subtraction.
d. color scattering.
____ 37. What are objects that produce visible light?
a. luminous
b. illuminated
____ 38. What kind of waves are used in radar for detecting the speed of a car?
a. gamma rays
c. infrared waves
b. X rays
d. microwaves
____ 39. What kind of waves can be used to treat some cancerous tumors?
a. gamma rays
c. infrared rays
b. X rays
d. microwaves
____ 40. Which electromagnetic wave does your skin need to produce Vitamin D?
a. microwaves
c. gamma rays
b. ultraviolet light
d. infrared waves
____ 41. A mirror that has a flat surface is
a. plane.
b. concave.
____ 42. Where are rods and cones located?
a. in the cornea
b. in the retina
____ 43. The membrane that protects the eye and through which light is refracted is the
a. iris.
c. retina.
b. pupil.
d. cornea.
____ 44. Muscles surrounding the lens of the eye
a. make the lens thicker or thinner so
b. keep the lens from changing so it can focus.
it can focus.
____ 45. What causes color deficiency?
a. one or more types of cones respond to the
b. one or more types of rods respond to the wrong color
wrong color
____ 46. The surface of a convex mirror
a. Curves outward.
b. curves inward.
____ 47. The surface of a concave mirror
a. Curves outward.
b. curves inward.
____ 48. A convex mirror and a concave lens both cause light rays to
a. slow down.
b. spread apart.
Short Answer
49. Explain how mechanical and electromagnetic waves are similar.
50. Explain how colors are separated in a rainbow.
51. List three uses or objects that contain lenses.
52. What is the difference between translucent, opaque, and transparent?
Answers to the short answer questions will vary. Check your essential questions for these.
Waves
Answer Section
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SHORT ANSWER
51. ANS:
Both types of waves are described by the properties of amplitude, wavelength, frequency, and speed.
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Rainbows form when water droplets refract sunlight. Light of shorter wavelengths, such as violet, is refracted
more than light of longer wavelength, such as red.
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Sample answers: cameras, telescopes, movie projectors, eyeglasses, magnifying lenses, microscopes.
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