Ch 14B Review

1
Ch 14B Review

• Sound

2

• Before play, request pass, run, kick, or punt
• Playing card for yards gained if correct
• cards give gain for runs
• cards X 2 give gain for passes
• No gain for incorrect runs
• No gain for incorrect passes (incomplete)
• JQK runs correct 10 yds
• JQK runs incorrect lose 5 yds
• JQK passes correct 20 yds
• JQK passes incorrect lose 10 yds (sack)
• Aces passes correct touchdown runs 11 or
  -1
• Aces passes incorrect interception for
  touchdown
• Kicking inside 30 yd line, if answer correct
  then kick good
• JOKER fumble, ball to other team
• Punt Automatically goes 40 yards, ball to other
  team

3
Volleyball

• One group must answer a question to serve in
  bounds
• Other group must answer one question to bump/dig,
  one question to set, and one question to spike it
  to other team.
• This process repeats itself until a question is
  missed.
• Rally scoring (highest total wins or 25/game
• The team who got the previous point serves the
  following point.

4
1 Unit for frequency
5
1

• Hertz, abbreviated Hz

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2 a unit used to measure sound level
7
2

• Decibel, abbreviated dB

8
3 a jarring combination of pitches often with
high ratio of frequency
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3 dissonance

• Comes from a higher whole-number ratio of
  frequencies of sounds played simultaneously

10
4 apparent highness or lowness of a musical
note
11
4 pitch
12
5 two frequencies that have a ratio of 21
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5 octave
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6 sound waves are this type of wave
15
6 longitudinal wave

• Also called compressional wave

16
7 the fastest state of matter for sound to
travel in
17
7 solid

• Sound moves faster in a solid due to the high
  level of elasticity that the molecules have in a
  solid
• Liquids 2nd-best

18
8 an oscillation of wave sound amplitude
caused by the sounding of two nearly identical
frequencies
19
8 beats (beat frequency)

• To find beat frequency, take difference of
  frequencies being played.

20
9 a pleasant combination of pitches
21
9 consonance

• Usually occurs when frequencies are played in
  harmony with low simple whole ratio between
  frequencies
• Music synonym harmony

22
10 frequency higher than the human audible
range
23
10 ultrasonic

• Dog whistles, medical applications, sonar

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11 When an object is moving 680 m/s in an
environment where sound moves 340 m/s, what is
the mach number of this objects speed?
25
11 Mach 2
26
12 The lowest frequency that will resonate in
a pipe
27
12 fundamental frequency
28
13 Equation to use to find perceived frequency
when source and observer are on collision course
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13

• fp fe (v vo)
• (v - vs)

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14 What is the beat frequency when two tuning
forks of frequencies 250 and 255 Hz are played at
the same time?
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14 5 Hz

• Beat frequency f2 f1

32
15 Place in a sound wave with greater than
average pressure
33
15 compression
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16 Place of maximum movement on string in
standing waves
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16 antinode
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17 What is the harmonics number for the
following string?
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17 four
38
Halftime
39
18 When a source and an observer are running
away from each other, the perceived frequency
heard will be ___ compared to the emitted
frequency.
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18 lower
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19 part of a sound wave with less than average
pressure
42
19 rarefaction
43
20 As the temperature of air increases, the
speed of sound ____.
44
20 increases

• SOS (331 m/s) v1 Tc/273

45
21 something moving faster than the speed of
sound
46
21 supersonic
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22 thunder-like sound created by the
constructive interference of sound waves emitted
by something moving faster than speed of sound
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22 shock wave, sonic boom
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23 term for tone quality, tone color, or sound
harmony quality
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23 timbre
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24 Equation for frequency of the fundamental
frequency of open pipe
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24 (f (n/2L) v)
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25 synonym for overtone
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25 harmonic
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26 Equation for the frequency heard by a string
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26 f (n/2L) v(F/µ)
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27 Synonym for shock wave
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27 sonic boom
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With closed tubes, the possible harmonics
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28 odds only
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29 place with maximum motion of the medium
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29 antinode
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30 Formula relating power and sound intensity
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30 I P/A P/4pr2
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31 Units for sound intensity
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31 W/m2
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32 the fourth harmonic of a 200 Hz fundamental
frequency
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32 800 Hz
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End of Game