Lecture 1 (1/23)

Question 1

Sound is what kind of movement?

Answer 1

Vibration

Question 2

Is sound a form of energy?

Answer 2

Yes

Question 3

Sound cannot exist without

Answer 3

Medium

Question 4

A medium must have what 2 components?

Answer 4

1. Mass
2. Elasticity

Question 5

Define mass

Answer 5

The amount of matter

Question 6

What is typically the medium?

Answer 6

air

Question 7

Is mass the same as weight?

Answer 7

No

Question 8

define density

Answer 8

mass per unit volume

Question 9

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

Answer 9

4 million

Question 10

Define elasticity

Answer 10

When something can recover from distortion

Question 11

How is elasticity measured?

Answer 11

Stiffness or Compliance

Question 12

Stiffness and compliance are

Answer 12

Inversely proportional

Question 13

more compliant is ____ stiff

Answer 13

less

Question 14

Define displacement

Answer 14

Movement from original position

Question 15

Displacement is caused by

Answer 15

Application of a force

Question 16

Force is measured in

Answer 16

Newtons

Question 17

Equilibrium is

Answer 17

No net force

Question 18

If force results in motion, the motion is opposed by

Answer 18

Friction

Question 19

The displacement from equilibrium is labeled as a molecules…

Answer 19

Amplitude

Question 20

Loudness is

Answer 20

Psychological perception of displacement, amplitude, intensity

Question 21

Intensity is

Answer 21

Measurable and quantitative

Question 22

The greater the displacement…

Answer 22

The louder the perceived sound

Question 23

What is displacement measured in?

Answer 23

dB or decibles

Question 24

T/F
Intensity is related how fast the molecules move

Answer 24

False

Question 25

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

Answer 25

False, frequency and intensity are independent of each other

Question 26

Define frequency

Answer 26

How fast the molecules move

Question 27

Does a faster frequency result in greater displacement?

Answer 27

No

Question 28

Frequency is measured in

Answer 28

Hertz

Question 29

Frequency is psychologically perceived as

Answer 29

Pitch

Question 30

Perception of displacement is _____ while perception of frequency is ______

Answer 30

loudness, pitch

Question 31

A faster vibration results in a faster…

Answer 31

Frequency

Question 32

Phase is

Answer 32

Where the molecule is relative to equilibrium

Question 33

What degrees can be equilibrium

Answer 33

0,180,360

Question 34

What degrees can be maximum displacement

Answer 34

90,270

Question 35

Vibratory motion is also called

Answer 35

oscillation

Question 36

Oscillation is a back and forth movement through ____

Answer 36

equilibrium

Question 37

What is the simplest type of vibratory motion?

Answer 37

Simple Harmonic Motion

Question 38

define compression/ condensation

Answer 38

increase in density (molecules are closer together)

Question 39

define rare fraction

Answer 39

decrease in density (molecules are farther apart)

Question 40

define a longitudinal wave

Answer 40

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)