Quiz 1

Question 1

What are the three acoustic variables?

Answer 1

Pressure, density, distance

Question 2

Directly related means

Answer 2

When one increases the other increases the

Question 3

Inversely related means?

Answer 3

When one increases the other decreases the

Question 4

What are sound waves?

Answer 4

Carries energy
Travels longitudinal
Can not move through a vacuum
Requires a medium
Can be compressed or rarefied

Question 5

What is a transverse wave?

Answer 5

Particles move in a different direction than the wave

Question 6

What is a longitudinal wave?

Answer 6

Particles move in same direction as the wave

Question 7

What are the 7 acoustic parameters?

Answer 7

Period
Frequency
Amplitude
Power
Intensity
Wavelength
Propagation speed

Question 8

What is the term for the concentration of energy in a sound beam?

Answer 8

Intensity

Intensity is a measure of how much energy is transmitted per unit area.

Question 9

What defines the rate of energy transfer or the rate at which work is performed?

Answer 9

Power

Power is measured in watts and indicates how quickly energy is used or transferred.

Question 10

What is the term for the rate at which a sound wave travels through a medium?

Answer 10

Propagation speed

Propagation speed varies depending on the medium’s properties.

Question 11

What does the term ‘period’ refer to in wavelength?

Answer 11

Time it takes for a wave to vibrate one cycle

The period is the inverse of frequency.

Question 12

What is the difference between maximum/minimum value and average value of an acoustic variable called?

Answer 12

Amplitude

Amplitude indicates the strength of the wave.

Question 13

What is the distance (length) of one complete cycle of a wave referred to as?

Answer 13

Wavelength

Wavelength is often measured in meters.

Question 14

What is the term for the number of cycles per second in wavelength?

Answer 14

Frequency

Frequency is measured in hertz (Hz).

Question 15

What is determined by the sound source only? (5)

Answer 15

Period
Frequency
Amplitude
Power
Intensity

Question 16

What is determined by sound source and medium?

Answer 16

Wavelength

Question 17

What is determined by a medium only?

Answer 17

Propagation speed

Question 18

Frequency and period have what type of relationship?

Answer 18

Inversely related
Reciprocal relationship

Question 19

Wavelength and frequency have what kind of relationship?

Answer 19

Inversely related

Question 20

Intensity and power have what type of relationship?

Answer 20

Directly related to

Question 21

Describe the relationship between power and amplitude

Answer 21

Directly related and proportional

Question 22

If amplitude increases by 4 what happens to power?

Answer 22

Power = amplitude ^2
Power = 4^2
Power = 16

Question 23

What is the relationship between intensity and amplitude?

Answer 23

Directly related and proportional

Question 24

Wavelength(mm) = 1.54mm/ ___________

Answer 24

Frequency

Question 25

Propagation speed(m/s) = frequency(Hz) times ________

Answer 25

Wavelength (m)

Question 26

What characteristics affect the speed of sound?

Answer 26

Density and stiffness

Question 27

What is the relationship between stiffness and speed?

Answer 27

Directly related to

Question 28

What is the relationship between density and speed?

Answer 28

Inversely related

Question 29

What is density in units

Answer 29

Kg/cm^3

Question 30

What is a reciprocal relationship?

Answer 30

When 2 numbers are multiplied together, the result is 1 Inverse relationship

Question 31

What is compression phase density?

Answer 31

High density (compressed)

Question 32

What is rarefaction phase?

Answer 32

Low density (stretched)

Question 33

Is period adjustable?

Answer 33

No

Question 34

Is frequency adjustable?

Answer 34

No

Question 35

Is amplitude adjustable?

Answer 35

Yes

Question 36

Is power adjustable?

Answer 36

Yes

Question 37

Is intensity adjustable?

Answer 37

Yes

Question 38

Is wavelength adjustable?

Answer 38

No

Question 39

Is speed adjustable?

Answer 39

No

Question 40

What is the range of frequency for subsonic sound?

Answer 40

Below 20Hz

Question 41

What is the frequency for audible sound?

Answer 41

Between 20Hz and 20kHz

Question 42

What is the frequency for ultrasound?

Answer 42

Above 20kHz

Question 43

What are the 3 bigness parameters?

Answer 43

Amplitude Power Intensity

Question 44

What are the units for intensity?

Answer 44

Watts/cm^2

Question 45

What is the formula for period and frequency?

Answer 45

Period X frequency = 1

Question 46

What are the metric prefixes in increasing to decreasing order?

Answer 46

Giga Mega Kilo Hecto Deca Deci Centi Mili Micro Nano

Question 47

What does Giga (G) represent?

Answer 47

1 billion ## Footnote Giga is a metric prefix used in the International System of Units (SI)

Question 48

What does Mega (M) represent?

Answer 48

1 million ## Footnote Meo is a less common metric prefix but is understood in the context of large quantities.

Question 49

What does Kilo (K) represent?

Answer 49

thousand ## Footnote Kild is used to denote a quantity of one thousand.

Question 50

What does Hecto (h) represent?

Answer 50

1 hundred ## Footnote Hecto is a metric prefix indicating a factor of one hundred.

Question 51

What does Deca (da) represent?

Answer 51

ten ## Footnote Deca is a metric prefix that signifies a factor of ten.

Question 52

Fill in the blank: Deci (a) = _______

Answer 52

Tenth ## Footnote Deci is used to denote one-tenth of a unit.

Question 53

Fill in the blank: Centi (c) = _______

Answer 53

1 hundredth ## Footnote Centi is a metric prefix indicating one part in one hundred.

Question 54

What does mili (m) represent?

Answer 54

1 thousandth ## Footnote Mili is a prefix used to indicate one part in one thousand.

Question 55

What does micro (u) represent?

Answer 55

1 millionth ## Footnote Micro is used as a prefix for one millionth of a unit.

Question 56

What does nano (n) represent?

Answer 56

1 billionth ## Footnote Nano is a prefix indicating one billionth of a unit.