Lecture 1 (1/23) Flashcards

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1
Q

Sound is what kind of movement?

A

Vibration

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2
Q

Is sound a form of energy?

A

Yes

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3
Q

Sound cannot exist without

A

Medium

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4
Q

A medium must have what 2 components?

A
  1. Mass
  2. Elasticity
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5
Q

Define mass

A

The amount of matter

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6
Q

What is typically the medium?

A

air

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7
Q

Is mass the same as weight?

A

No

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8
Q

define density

A

mass per unit volume

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9
Q

Which is more dense? 4 air molecules in a container or 4 million air molecules in a container?

A

4 million

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10
Q

Define elasticity

A

When something can recover from distortion

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11
Q

How is elasticity measured?

A

Stiffness or Compliance

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12
Q

Stiffness and compliance are

A

Inversely proportional

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13
Q

more compliant is ____ stiff

A

less

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14
Q

Define displacement

A

Movement from original position

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15
Q

Displacement is caused by

A

Application of a force

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16
Q

Force is measured in

A

Newtons

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17
Q

Equilibrium is

A

No net force

18
Q

If force results in motion, the motion is opposed by

A

Friction

19
Q

The displacement from equilibrium is labeled as a molecules…

A

Amplitude

20
Q

Loudness is

A

Psychological perception of displacement, amplitude, intensity

21
Q

Intensity is

A

Measurable and quantitative

22
Q

The greater the displacement…

A

The louder the perceived sound

23
Q

What is displacement measured in?

A

dB or decibles

24
Q

T/F
Intensity is related how fast the molecules move

A

False

25
Q

T/F
If you change frequency you have to change the intensity

A

False, frequency and intensity are independent of each other

26
Q

Define frequency

A

How fast the molecules move

27
Q

Does a faster frequency result in greater displacement?

A

No

28
Q

Frequency is measured in

A

Hertz

29
Q

Frequency is psychologically perceived as

A

Pitch

30
Q

Perception of displacement is _____ while perception of frequency is ______

A

loudness, pitch

31
Q

A faster vibration results in a faster…

A

Frequency

32
Q

Phase is

A

Where the molecule is relative to equilibrium

33
Q

What degrees can be equilibrium

A

0,180,360

34
Q

What degrees can be maximum displacement

A

90,270

35
Q

Vibratory motion is also called

A

oscillation

36
Q

Oscillation is a back and forth movement through ____

A

equilibrium

37
Q

What is the simplest type of vibratory motion?

A

Simple Harmonic Motion

38
Q

define compression/ condensation

A

increase in density (molecules are closer together)

39
Q

define rare fraction

A

decrease in density (molecules are farther apart)

40
Q

define a longitudinal wave

A

the direction of the particle is parallel to wave movement & the wave moves in the same plane
eg: saloon doors burst open in the same direction that the force (push) was applied
eg 2: an example of non longitudinal wave would be a rock being dropped into a bond where the force is seen going in waves around the rock (ripples) instead of down (the same direction the force was applied)

41
Q
A