Exam 1

Question 1

Relationship and difference between pitch and frequency

Answer 1

Relationship - The greater the frequency, the higher the pitch we perceive. The lower the frequency, the lower the pitch we perceive
Difference - Frequency is physiologic and can be measured but pitch is psychological and cannot be measured

Question 2

Simple harmonic motion

Answer 2

Simplest form of sound; wave of disturbance that travels through a medium single frequency that’s depicted by a sine wave

Question 3

Peak-to-peak amplitude

Answer 3

Linear measure from the point of maximum displacement in one direction to the point of maximum displacement in the opposite direction

Question 4

Frequency

Answer 4

Number of complete cycles that occur during a certain time frame; usually in 1 second (expressed as Hertz or cycles per second)

Question 5

Mass

Answer 5

The amount of matter present which is capable of vibratory motion

Question 6

Medium

Answer 6

That through which sound is transmitted (vibration is required to be a medium)

Question 7

Transverse wave motion

Answer 7

The direction of vibration of the air is at a right angle to the direction the wave is propagated

Question 8

In-phase

Answer 8

A sound is in-phase when the areas of compression occur at the same time as all the other areas of compression and the areas of rarefaction occur at the exact same time as all the other areas of rarefactions (only said to be in-phase when all sounds are the same frequency)

Question 9

Compression

Answer 9

When you increase the density you increase the number of air molecules in a given space than there are at equilibrium

Question 10

Root mean square

Answer 10

Absolute scientific calculation that takes into account the fact that soundwaves lose amplitude over time and that one cycle of vibration differs from one to the next (the point of max displacement loses amplitude over time)

Question 11

Frequency - wavelength relationship

Answer 11

As frequency increases, wavelength decreases and as frequency decreases, wavelength increases

Question 12

Temporal properties of a sine wave

Answer 12

Study of the movement of a single molecule over a period of time (cycle, period, and frequency)

Question 13

A cycle

Answer 13

Equilibrium to the point of maximum displacement in one direction back through equilibrium to maximum displacement in the opposite direction back to equilibrium

Question 14

Weight

Answer 14

Amount of gravitational force exerted on a mass

Question 15

Period

Answer 15

Time it takes for a vibrating source to complete one entire cycle of vibration (expressed in seconds)

Question 16

Wavelength

Answer 16

Linear measure that refers to the distance a sound wave can travel during one complete cycle of vibration (expressed in feet)

Question 17

Equilibrium

Answer 17

State of rest

Question 18

Peak amplitude

Answer 18

Linear measure from equilibrium to maximum displacement in one direction

Question 19

Phase

Answer 19

Where the particle is positioned at any given instant in time (picture a sine wave as a circle)

Question 20

Longitudinal wave motion

Answer 20

The direction of air particle movement is parallel to the direction of wave movement

Question 21

Difference and relationship between amplitude and loudness

Answer 21

Relationship - The greater the amplitude, the greater the loudness we perceive, and the less the amplitude, the less loud we perceive the sound.
Difference - Amplitude is physiologic and we can measure it and loudness is psychological which can’t be measured

Question 22

Spatial properties of a sine wave

Answer 22

Reflect the position of the air molecules at any given instant in time during its travel (amplitude and wavelength)

Question 23

180 degrees out of phase

Answer 23

Sounds are 180 degrees out of phase when one wave is in a state of compression while the other wave is in a state of rarefaction (occur in opposition to each other). Results in silence because the waves cancel each other out (dead spot)

Question 24

The source

Answer 24

Anything that can produce sound

Question 25

Rarefaction

Answer 25

When you decrease the density, the air starts to rebound so there are less air molecules in a given space than there are at equilibrium

Question 26

Inertia

Answer 26

The tendency of a body in motion to remain in motion; the tendency of a body at rest to remain at rest

Question 27

Period-frequency relationship

Answer 27

As frequency increases, period decreases and as frequency decreases, period increases

Question 28

Elasticity

Answer 28

Property of all matter be it solid, liquid, or gas which allows it to undergo distortion in either shape or volume when force is applied

Question 29

Out-of-phase

Answer 29

Sounds are out-of-phase when their areas of compression don’t occur at the exact same time and their areas of rarefaction don’t occur at the exact same time. Creates a new sound of different amplitude and frequency