Hearing Science - Quiz 4

Front 1

Energy Source

Back 1

A source from which sound energy originates. Primary role is to generate a vibration into the system.

Front 2

Medium

Back 2

Matter that supports sound. Gases, liquids, solid, plasma (ions).

A medium allows disturbance to travel relatively large distances.

Front 3

Helium

Back 3

Less dense than they air we breathe; it changes the frequency of our voice.

Front 4

Receptor

Back 4

Receiving end for sound.

Example, microphone.

Front 5

Vibration

Back 5

Refers to the to and fro motion of an object. Vibration can be simple or complex.

Front 6

Elasticity

Back 6

Property of returning to an initial state following deformation.

Something that "bends" and stays that way is elastic. Ex., a twist tie.

Air molecules are elastic.

Front 7

Inertia

Back 7

Tendency of an object to resist acceleration, and remain at rest.

Moving air molecules want to remain in motion (Newton).

Front 8

Damping

Back 8

Reduction in the size of oscillations (vibrations) due to resistance.

Front 9

Brownian Motion

Back 9

We are surrounded by air molecules that are constantly moving around in a manner.

Front 10

Compression

Back 10

Compression creates high pressure in the atmosphere. Molecules are close together. This is represented by positive amplitude on a sine wave.

Front 11

Rarefaction

Back 11

Rarefaction creates low pressure in the atmosphere. Molecules are farther apart. This shows is negative amplitude on a sine wave.

Front 12

Pressure Wave

Back 12

Series of compressions and rarefactions; occurs over time.

Front 13

Air Molecules

Back 13

Will try to fill the space that was vacated by a vibrating object moving in the opposite direction.

Front 14

Rarefactions and Condensations

Back 14

Create changes in pressure.

Front 15

Perception

Back 15

We perceive intensity as loudness. An increase in intensity can be seen as an increase in amplitude.

Front 16

Pressure

Back 16

The amount of force per unit area and is the definition of work.

Front 17

Power

Back 17

The rate at which work is done.

Front 18

Sound Pressure Level

Back 18

One way of looking at sound intensity. Look at the amount of pressure over a unit area.

Due to the range in pressure stimuli, sound pressure level is measured on a decibel scale.

Sound pressure level is a measure of two intensities.

Front 19

Magnitude

Back 19

Strength of Sound.

Front 20

Reference

Back 20

The smallest amount of pressure needed for a sound to be barely audible.

Front 21

Dyne

Back 21

The smallest amount of pressure that is detectable by a normally hearing young adult.

Front 22

Wavelength

Back 22

Distance between each successive rarefaction or each successive condensation.

Front 23

Sound Intensity

Back 23

How hard we are working to create a sound.

There is an exact relationship between intensity and pressure; if pressure increases so does intensity.

Front 24

Amplitude

Back 24

Refers to measures of pressure and displacement.