Quiz #2

Question 1

True or false:

the lower the fundamental frequency is the more frequencies will appear in the harmonic series?

Answer 1

True

Question 2

What is the equation for a wavelength?

Answer 2

See physical flashcards

Question 3

Can we measure a wavelength from any point in one cycle to the same point in the next cycle?

Answer 3

Yes

Question 4

Frequency is directly related to…?

Answer 4

Pitch

Question 5

What is harmonics?

Answer 5

All the tones created by complex vibrations

Question 6

What is periodic?

Answer 6

The pattern of vibration repeating itself

Question 7

True or false:

a simple sine wave is always periodic?

Answer 7

True

Question 8

What is a complex wave?

Answer 8

Multiple frequencies

Question 9

What can young and healthy ears detect vibrations as low as and as high as?

Answer 9

20 Hz and 20,000 Hz.

Speech is heard at 100 Hz to 5000 Hz

Question 10

What does a spectral plot give us?

Answer 10

Amplitude on the Y axis and frequency on the X axis

Question 11

What are the physical properties of Sound?

Answer 11

• Time
• Intensity/amplitude
• Frequency
• period
• Velocity

Question 12

How do you calculate the harmonic series when the sound is 200 Hz and the fundamental frequency equals 200

Answer 12

first harmonic = 200x1= 200Hz
second harmonic 200×2 = 400 Hz
third harmonic is 200×3 = 600 Hz
And so on

Question 13

How can a periodic wave be distinguished from an aperiodic wave?

Answer 13

Based on the mathematical relationships among the frequencies of their components. Aperiodic won’t have a pattern or a mathematical relationship

Question 14

What is the fundamental frequency?

Answer 14

Lowest frequency there is in a waveform/complex tone

Question 15

What is a phase relationship?

Answer 15

Where waveforms meet

Question 16

What is amplitude measured in?

Answer 16

Decibels (dB)

Question 17

When would you expect to see higher frequencies that are farther apart?

Answer 17

Whenever you start with a higher fundamental frequency

Question 18

For a child with a high pitch will they have more frequencies in the harmonic series or less

Answer 18

Less. Fewer frequencies and are farther apart because you start with a higher fundamental freq.

Question 19

Are intensity and loudness linearly related?

Answer 19

No

Question 20

What are boundary behaviors?

Answer 20

Sound bouncing off the object and sound returning

Question 21

True or false:

as frequencies get higher, it takes a larger change in Hz to cause a change in sensation of Pitch?

Answer 21

True

Question 22

Can a simple tone/waveform be aperiodic?

Answer 22

No

Question 23

What is always the first harmonic in the series?

Answer 23

Fundamental frequency

Question 24

Does a harmonic need to include all the harmonic series?

Answer 24

No, it can skip, but it must be a mathematical relationship between odds and evens

Question 25

What is a constructive pressure wave?

Answer 25

When crest meets crest or troughs meet trough In phase and 90% out of phase

Question 26

What are the perceptual properties of sound?

Answer 26

- Loudness | - Pitch

Question 27

What is pitch measured?

Answer 27

Mels

Question 28

What is Hz measured in?

Answer 28

Cycles per second

Question 29

What is a complex wave?

Answer 29

Different frequencies

Question 30

What is "in phase"?

Answer 30

When troughs and peaks of the waveform are in the same wave

Question 31

What is reverberate?

Answer 31

Sound bounces back and forth. Echo

Question 32

What is a wave pattern of vibrations, no matter how complex and how often it repeats itself?

Answer 32

Complex periodic soundwave

Question 33

What is a destructive pressure wave?

Answer 33

When crest meets trough (silence)

Question 34

If the vibration of a wave is random and has no repeatable pattern it is...?

Answer 34

A complex aperiodic soundwave

Question 35

``` Sound = tone Wave = how it travels Waveforms = when we draw it out ```

Answer 35

.

Question 36

Is loudness perceptual or physical?

Answer 36

Perceptual It is perceived that if the intensity is higher than it is louder

Question 37

What type of tone will you get with two pure tones of the same frequency?

Answer 37

Pure tone/sine wave

Question 38

What are waves characteristics?

Answer 38

- Boundary behaviors - Interference patterns - pure tones

Question 39

What type of tone will you get with two pure tones of different frequencies?

Answer 39

A complex tone

Question 40

What is the velocity for meters?

Answer 40

344 m/seconds

Question 41

What is velocity measured in feet?

Answer 41

1130 feet/second

Question 42

What is the resulting wave of two signals of the same frequency and 180° out of phase?

Answer 42

The result is silence. Each particle has been subjected to equal forces acting in opposing directions

Question 43

Proper acoustic design helps with what?

Answer 43

Sound travel through space ( e.g. Concert halls)

Question 44

What is the Fourier analysis?

Answer 44

A different sort of displaying called a spectral plot. That allows us to indicate the frequency and amplitude of each harmonic in a complex periodic wave

Question 45

What two factors does wavelength depends upon?

Answer 45

- The velocity of a soundwave (c) - The frequency of the vibration (f) See the equation for wavelength

Question 46

What is a Pure tone?

Answer 46

- A single periodic frequency vibrating in simple harmonic motion/creates a sign wave. - A vibration that repeats itself at a constant number of cycles per second. - It is unnatural

Question 47

What is the resulting wave of two signals of the same frequency for "in phase", 90% out of phase and 180% out of phase?

Answer 47

They will have an amplitude equal to the sum of the amplitudes of each wave

Question 48

What is considered noise?

Answer 48

An aperiodic complex tone of two or more components frequencies not harmonically related. No fundamental frequency. No harmonics.

Question 49

What does a wavelength represent?

Answer 49

The velocity over the frequency. It represents one cycle.

Question 50

What is aperiodic?

Answer 50

No repeatable patterns of vibration in the soundwave

Question 51

We can determine the fundamental frequency of the sound the waveform represents by...?

Answer 51

- Counting the number of times it's patterned is repeated per cycle - We can then calculate the frequency of the individual harmonics - We cannot discover the amplitudes of individual harmonics

Question 52

What is pitch?

Answer 52

- a sensation | - a perception by listener when frequencies change

Question 53

What is a harmonic series?

Answer 53

Each tone created in a complex vibration is called "harmonic". The whole set of tones is called harmonic series

Question 54

What are interference patterns?

Answer 54

- Signals of the same frequency can interfere with each other - Same frequency, two sources or signal is reflected from a barrier and competes with itself

Question 55

Loudness is directly related to what?

Answer 55

Amplitude/intensity

Question 56

What is loudness measured by?

Answer 56

Phones and sones

Question 57

The amplitude of the vibration is...?

Answer 57

The extent of particle displacement, which is an indication of the intensity or power of the sound

Question 58

What is a sine wave?

Answer 58

A pure tone. Single frequency

Question 59

What are the three graphic representations for analysis of sound?

Answer 59

- Waveform - Spectral plot - Spectrogram

Question 60

Low-frequency wave has more or less vibratory cycles/second?

Answer 60

More

Question 61

Do lower frequencies have a bigger or smaller wavelength?

Answer 61

Bigger

Question 62

High-frequency waves have more or less vibratory cycles per second?

Answer 62

Less

Question 63

Higher frequency sounds have shorter or longer wavelength

Answer 63

Shorter/smaller