Chapter 12 Review

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Chapter 12 Review

• Mr. Hauser

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Rules of the Game

• Working in TEAMS, you will be asked to answer
  questions from the assigned chapters.
• You have 30 seconds to write the answer down on
  the dry erase board.
• When the teacher says TIMES UP, a team leader
  will stand up and show the teacher their answer.

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Rules (Continued)

• Each correct answer is worth one point, unless
  otherwise stated.
• Teams can lose points for inappropriate conduct,
  comments, or cheating.
• The team with the most points at the end of the
  game wins!

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Question 1

• The very top part of a wave is called the
  ___________.

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ANSWER

• crest

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Question 2

• The distance between equilibrium and crest of a
  wave is called the ______.
• frequency
• wavelength
• amplitude
• period
• speed

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ANSWER

• C) amplitude

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Question 3

• The distance from one point on a wave to the same
  point on the next consecutive wave is called
  __________.
• frequency
• wavelength
• amplitude
• period
• speed

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ANSWER

• B) Wavelength

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Question 4

• The mathematical name for the shape of a wave is
  called a __________ wave.

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ANSWER

• sine

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Question 5

• Since sound cannot travel in a vacuum it is
  called a(n)
• A) mechanical wave
• B) non-mechanical wave
• C) transverse wave
• D) Electromagnetic wave

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ANSWER

• A) Mechanical wave

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Question 6

• What are the metric units used to measure
  frequency?

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ANSWER

• Hertz

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Question 7

• The faster the sound moves through the air,
• the colder the air must be.
• the warmer the air must be.
• the dryer the air must be.
• the higher frequency sound it must be.

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ANSWER

• B) the warmer the air must be

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Question 8

• What is the range of human hearing?
• 5 Hz-5,000 Hz
• 10 Hz - 10,000 Hz
• 20 Hz - 20,000 Hz
• 30 Hz - 30,000 Hz
• 40 Hz - 40,000 Hz

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ANSWER

• C) 20 Hz - 20,000 Hz

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Question 9

• What is the type of wave that vibrates its medium
  perpendicular to its direction of travel? Hint
  light, x-rays, radio waves fall into this category

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ANSWER

• Transverse waves

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Question 10

• What is the other name for a longitudinal wave?

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ANSWER

• Compression wave

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Question 11

• In a longitudinal wave the area between
  compressions is called

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ANSWER

• rarefaction

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Question 12

• What is the symbol used for wavelength?

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ANSWER

• Lambda (?)

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Question 13

• Which two factors affect the speed of sound in
  air?
• frequency and period
• amplitude and wavelength
• air temperature and humidity
• wavelength and elasticity

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ANSWER

• C) Air temperature and humidity

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Question 14

• The pitch of a sound depends on which of these?
• wavelength
• amplitude
• intensity
• loudness
• frequency

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ANSWER

• E) frequency

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Question 15

• Sound travels fastest in
• solids.
• liquids.
• gases.
• a vacuum.

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ANSWER

• A) solids

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Question 16

• When a sound strikes a barrier and bounces back
  to the listener he or she perceives an ________.

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ANSWER

• echo

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Question 17

• When sound waves bend due to a difference in air
  temperature it is called
• reflection
• reverberation
• echoing
• refraction

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ANSWER

• D) refraction

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Question 18

•  Sound waves that are beyond the frequency range
  of human hearing are called _____________.

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ANSWER

• Ultrasonic

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Question 19

• When one vibrating object makes contact with
  another causing the second one to vibrate it has
  made
• an echo.
• reverberation.
• a forced vibration.
• the Doppler Effect.

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ANSWER

• C) Forced Vibration

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Question 20

• Loudness of sound is measured in units called...

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ANSWER

• Decibels

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Question 21

• The special frequency an object has that depends
  on its elasticity and shape is referred to as...

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ANSWER

• Natural Frequency

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Question 22

• When an object receives a sympathetic vibration
  from an outside source that matches its natural
  frequency and the object vibrates with a large
  amplitude _____________ is occurring.

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ANSWER

• Resonance

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Question 23

• The Tacoma Narrows bridge that was resonated by
  the wind and literally shook itself apart was
  located in what state?

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ANSWER

• Washington

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Question 24

• When two waves occupy the same space at the same
  time they __________ with one another.

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ANSWER

• Interfere

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Question 25

• When two waves interfere that are in phase and
  the resulting wave that gets created has a larger
  amplitude __________ interfence has occured.

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ANSWER

• Constructive

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Question 26

• The apparent change in frequency of a wave due to
  the motion of a source or observer is called

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ANSWER

• The Doppler Effect

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Question 27

• If you can travel faster than the speed of sound,
  observers would hear a ________ ________ after
  you pass by.

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ANSWER

• sonic boom

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Question 28

• If you travel at twice the speed of sound, you
  are traveling at _______ 2.

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ANSWER

• Mach

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Question 29

• When an object is traveling close to the same
  speed as the waves its generating, the v-shaped
  wave generated by the combination of all of the
  waves from the object is called a

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ANSWER

• bow wave

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Question 30

• An object such as an airplane moving toward you
  would sound to you as
• a higher pitch than its really making.
• a lower pitch than its really making.
• the same pitch that its making.

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ANSWER

• A) a higher pitch than its really making

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Question 31

• At night when the air close to the ground is cold
  and the air up high is warm, sound waves are
• refracted down to the ground.
• refracted up toward the sky.
• not refracted at all.

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ANSWER

• A) refracted down to the ground.

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Question 32

• If a sound wave has a frequency of 340 Hz, what
  is its wavelength? (Hint you need to know the
  speed of sound in air)

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ANSWER

• 1 meter

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Question 33

• What is the name of the point on a standing wave
  that does not vibrate?

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ANSWER

• node

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Question 34

• If one singer sings at 85 decibels, how many
  decibels would two singers produce?

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ANSWER

• 88 decibels

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Question 35

• If you double your distance away from a source of
  sound you perceive its intensity to be _____ its
  original value. (be exact)

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ANSWER

• One forth

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Question 36

• What are the metric units used to measure sound
  intensity?

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ANSWER

• W/m2

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Question 37

• A sound that has a power of 4.4 x 10-3W has an
  intensity of 5.60 x 10-7W/m2 at what distance?

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ANSWER

• 25 m

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Question 38

• The sound quality that a listener perceives as
  specific to a certain sound, voice, or instrument
  is called

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ANSWER

• timbre

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Question 39

• If a pipe opened at both ends is made longer, its
  frequency
• gets bigger.
• gets smaller.
• stays constant.

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ANSWER

• B) Gets smaller

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Question 40

• By tightening a guitar string, you effectively
  make the speed of a wave in that string faster.
  By doing so it would produce a _________ pitch.
• Higher
• Lower
• The same

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ANSWER

• A) Higher

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Question 41

• If the length of a pipe opened at both ends is
  decreased, its fundamental frequency
• increases.
• decreases.
• remains constant.

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ANSWER

• A) increases

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Question 42

• If the air inside a pipe closed at one end gets
  colder, its fundamental frequency
• decreases.
• increases.
• remains constant.

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ANSWER

• A) decreases

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Question 43

• What frequency is the second harmonic of a pipe
  opened at both ends that is 52 cm long? (The
  speed of sound in air is 343 m/s) Report the
  answer in proper units

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ANSWER

• 660 Hz

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FINAL QUESTION

• What is the term for the rhythmic pattern
  generated from two similar frequencies
  interfering with one another.

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ANSWER

• beats