Chapter 16 Cont. Sound

Question 0

What is required in order for sound to be transmitted

Answer 0

A medium

Question 1

What is sound

Answer 1

A longitudinal wave created by a vibrating object

Question 2

In what type of mediums can sound travel

Answer 2

Solids liquids gases

Question 3

Region of increased air pressure due to compression

Answer 3

Condensation

Question 4

Region where air pressure is slightly less than normal due to inward motion

Answer 4

Rarefaction

Question 5

Frequency

Answer 5

Number of cycles per second that passes by a given location

Question 6

Pure tone

Answer 6

A sound with a single frequency

Question 7

Ultrasonic

Answer 7

Sound waves with frequencies above 20K hertz

Question 8

Infrasonic

Answer 8

Sound waves with frequencies below 20 hertz

Question 9

Pitch

Answer 9

The subjective quality of the frequency detected by the ear and interpreted by the brain

Question 10

Pure tone with a large frequency

Answer 10

High pitched sound

Question 11

Pure tone with a small frequency

Answer 11

Low pitched sound

Question 12

What is the objective property of a sound wave

Answer 12

Pressure amplitude

Question 13

Magnitude of the maximum change in pressure, measured relative to the undos turned or atmospheric pressure

Answer 13

Pressure amplitude

Question 14

What is the subjective property of a sound wave

Answer 14

Loudness

Question 15

Attribute of sound that depends primarily on the amplitude of the wave

Answer 15

Loudness

Question 16

What is the elastic limit of a sound wave

Answer 16

Approximately 10^9 Hz

Question 17

Through which medium does sound travel fastest and why

Answer 17

Solids bc solid particles are held together by large binding forces

Question 18

Through which medium does sound travel slowest and why

Answer 18

Gases bc gas particles have virtually no binding forces between them

Question 19

What is power

Answer 19

Amount of energy transported per second of a wave

Question 20

The sound power that passes perpendicularly through a surface divided by the area of that suface

Answer 20

Sound intensity

Question 21

What is the definition and value of the threshold of hearing

Answer 21

Smallest sound intensity that a uniform ear can detect

1 x 10^-12 W/m^2

Question 22

What is the relationship between intensity and the distance from the source

Answer 22

Inversely proportional

Question 23

What does the area stand for in the intensity equation

Answer 23

The area of the object, could be a square, sphere etc.

Question 24

What is the measurement unit used when comparing two sound waves

Answer 24

Decibels

Question 25

What are the properties that affect the speed of sound

Answer 25

Density Elasticity Temperature

Question 26

How is the speed of sound affected by the density of the medium

Answer 26

The more dense the medium, the slower the speed and vice versa AKA inverse relationship

Question 27

How does the elasticity of the medium affect the speed of sound

Answer 27

The more elastic the medium, the faster the speed of sound AKA direct relationship

Question 28

How does the temperature of the medium affect the speed of sound

Answer 28

The hotter the medium, the faster the speed of sound AKA direct relationship

Question 29

How are beats formed?

Answer 29

Overlapping waves with slightly different frequencies

Question 30

What is the beat frequency and how is it calculated

Answer 30

The number of times per second that the loudness rises and falls Difference btw the two sound frequencies

Question 31

Chord

Answer 31

Pattern of beat frequency

Question 32

Consonant

Answer 32

Two frequencies sound pleasant together

Question 33

Dissonant

Answer 33

Two frequencies sound unpleasant together

Question 34

What is the ratio created by consonant frequencies

Answer 34

Numbers will be 5 or less

Question 35

What is resonance

Answer 35

The forced vibration of an object by another oscillation, causing it to vibrate at the same frequency

Question 36

What is the natural or resonant frequency!

Answer 36

Frequency at which resonance occurs

Question 37

What does the natural or resonant frequency often cause

Answer 37

An amplification of vibration of the "driven" object

Question 38

What occurs when a note is played on a musical instrument

Answer 38

Several standing waves are resonating within the instrument simultaneously

Question 39

Harmonics

Answer 39

The frequencies corresponding to standing waves

Question 40

What is the fundamental frequency

Answer 40

The loudest and lowest; | The note that you hear

Question 41

Overtone

Answer 41

Higher and fainter | Other frequencies

Question 42

Timbre

Answer 42

The quality of the sound determined by the number and relative intensities of the overtones produced

Question 43

What does the timbre do to each instrument

Answer 43

Gives each instrument a unique sound

Question 44

In terms of harmonics, what is the first overtone and it's wavelength

Answer 44

It is the 2nd harmonic with a 2/2 wavelength

Question 45

What kind of waves do sound waves create in tubes

Answer 45

Standing waves

Question 46

How are standing waves created in a tube

Answer 46

The waves reflect off the ends of the tube (even if the ends are open) and the downward and upward waves combine to form a standing wave

Question 47

What do the standing waves in both open ended tubes end in?

Answer 47

Antinodes

Question 48

What type of standing waves do tubes only open at one end produce

Answer 48

Standing waves of odd harmonic frequencies