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Repetitious waves are a ________ transfer of ______.
Repetitious waves are a cyclical transfer of energy.

The major classifications of waves are ______________ and __________.
The major classifications of waves are electromagnetic and mechanical.

An electromagnetic wave does not need a _____ to propagate.
An electromagnetic wave does not need a medium to propagate.

A _________ wave needs a medium to propagate.
A mechanical wave needs a medium to propagate.

There can be no ________ waves in a vacuum.
There can be no mechanical waves in a vacuum.

A vacuum is the absence of a ______.
A vacuum is the absence of a medium.

There is no sound in a _____, since there is no medium.
There is no sound in a vacuum, since there is no medium.

Two classifications of mechanical waves are _________ and ____________.
Two classifications of mechanical waves are transverse and longitudinal.

In a ________ wave, the particle motion is back and forth "longitudinally" or in the same direction as the wave propagation.
In a longitudinal wave, the particle motion is back and forth "longitudinally" or in the same direction as the wave propagation.

In a ________ wave, particle motion is perpendicular or "transverse" to the wave direction.
In a transverse wave, particle motion is perpendicular or "transverse" to the wave direction.

Sound is a ________, mechanical wave.
Sound is a longitudinal, mechanical wave.

A longitudinal wave have areas of ___________ and compression.
A longitudinal wave have areas of rarefaction and compression.

An area of ________ is where the particles are father apart than the normal state.
An area of rarefaction is where the particles are father apart than the normal state.

An area of ___________ is where the particles are close together than the normal state.
An area of compression is where the particles are close together than the normal state

Not all waves need a ______ to propagate; _____________ waves can operate in a vacuum.
Not all waves need a medium to propagate; electromagnetic waves can operate in a vacuum.

_________ is a way of specifying how fast a wave is cyclically varying.
Frequency is a way of specifying how fast a wave is cyclically varying.

The unit for frequency is _____ which is an abbreviation for cycles per ______.
The unit for frequency is Hertz which is an abbreviation for cycles per second.

Frequency has units which are the inverse of _____, or one divided by ________, also called Hz.
Frequency has units which are the inverse of time, or one divided by seconds, also called Hz.

The number of times a longitudinal wave reaches maximum compression and rarefaction per time is called the _________.
The number of times a longitudinal wave reaches maximum compression and rarefaction per time is called the frequency.

The reciprocal of frequency is the ______.
The reciprocal of frequency is the period.

The period has units of ____.
The period has units of time.

The reciprocal of the ______ is frequency. Frequency has units of Hertz.
The reciprocal of the period is frequency. Frequency has units of Hertz.

The _____ is the time between cycles of peak compression in a longitudinal wave such as sound.
The period is the time between cycles of peak compression in a longitudinal wave such as sound.

The ____ between cycles of peak compression is the same as the time between cycles of peak rarefaction.
The time between cycles of peak compression is the same as the time between cycles of peak rarefaction.

The _____ is the ____ between cycles of peak rarefaction.
The period is the time between cycles of peak rarefaction.

Frequency and period are ________.
Frequency and period are reciprocals.

The units for __________ and period are ___________.
The units for frequency and period are reciprocals.

Hertz and ____ or seconds are inversely related.
Hertz and time or seconds are inversely related.

Since frequency and period are inversely related, if the frequency increases the period _________.
Since frequency and period are inversely related, if the frequency increases the period decreases.

A shorter period means higher _________.
A shorter period means higher frequency.

A lower __________ means a longer period.
A lower frequency means a longer period.

The ________ is the physical measure of distance between wave peaks or similarly wave minima.
The wavelength is the physical measure of distance between wave peaks or similarly wave minima.

Wavelength is the measure of _______ and therefore in the metric system has units of ______.
Wavelength is the measure of distance and therefore in the metric system has units of meters.

The period is a measure of ____ between peaks whereas the _______ is a measure of distance between peaks.
The period is a measure of time between peaks whereas the wavelength is a measure of distance between peaks.

Frequency and ______ are related through the wave propagation velocity.
Frequency and wavelength are related through the wave propagation velocity.

The ________ ________ is a measure of how fast a wave will travel.
The propagation velocity is a measure of how fast a wave will travel.

The propagation velocity, (c), equals the frequency, (f), times the _________ or f⋅λ=c.
The propagation velocity, (c), equals the frequency, (f), times the wavelength or f⋅λ=c.

For a given propagation velocity, if the frequency ________, the __________ increases.
For a given propagation velocity, if the frequency decreases, the wavelength increases.

For a given propagation velocity, if the frequency increases, the __________ must decrease.
For a given propagation velocity, if the frequency increases, the wavelength must decrease.

Frequency and wavelength have an _______ relationship.
Frequency and wavelength have an inverse relationship.

If the propagation velocity changes, and the frequency is not changed the _______ must change.
If the propagation velocity changes, and the frequency is not changed the wavelength must change.

To determine the ________, the frequency and the propagation velocity must be known.
To determine the wavelength, the frequency and the propagation velocity must be known.

The frequency, wavelength and propagation velocity are related together by the equation ______.
The frequency, wavelength and propagation velocity are related together by the equation f⋅λ=c.

The _______ of a signal is a measure of how big or loud it is.
The amplitude of a signal is a measure of how big or loud it is.

The _________ is determined as the maximum variation from the mean.
The amplitude is determined as the maximum variation from the mean.

For a wave, the ____ is the same average.
For a wave, the mean is the same average.

The ____ = (maximum+minimum)÷2.
The mean = (maximum+minimum)÷2.

If the maximum is 20 and the minimum is 10, the mean is __.
If the maximum is 20 and the minimum is 10, the mean is 15.

The difference between the maximum and the mean is the same as the difference between the mean and the _______.
The difference between the maximum and the mean is the same as the difference between the mean and the minimum.

Since the amplitude equals the difference between the maximum and the mean, the ______ also equals the difference between the ___ and the minimum. Or: Amplitude + max mean = mean  min
Since the amplitude equals the difference between the maximum and the mean, the amplitude also equals the difference between the mean and the minimum. Or: Amplitude + max mean = mean  min

If the _________ of an ultrasound echo increases, the Bmode image will get brighter.
If the amplitude of an ultrasound echo increases, the Bmode image will get brighter.

If the _______ of a Doppler echo ________, the Doppler audio will get louder.
If the amplitude of a Doppler echo increases, the Doppler audio will get louder.

Amplitude is used to measure any wave variable. For sound waves, the units of amplitude will be any measure of four ______ variables.
Amplitude is used to measure any wave variable. For sound waves, the units of amplitude will be any measure of four acoustic variables.

For electrical waves, ______ is used to measure parameters of electric variables such as voltage.
For electrical waves, amplitude is used to measure parameters of electric variables such as voltage.

Some possible units of ______ are Pascals, degrees Celsius, meters, kg/m.
Some possible units of amplitude are Pascals, degrees Celsius, meters, kg/m.

A wave which has a physical interaction with the ______ is called a mechanical wave.
A wave which has a physical interaction with the medium is called a mechanical wave.

A change within the ______ caused by a wave is called a variable.
A change within the medium caused by a wave is called a variable.

For an acoustic wave, the changes cause to the medium are called _____ variables.
For an acoustic wave, the changes cause to the medium are called acoustic variables.

There are ____ acoustic variables.
There are four acoustic variables.

The Four acoustic variables are:
 1) pressure
 2) distance (particle displacement)
 3) temperature
 4) density

Units of _______ are: meters, feet, miles, yards ect.
Units of distance are: meters, feet, miles, yards ect.

Units of ______ are: Pascals Atmospheres, mmHg, kg/m^{2}, lbs/in^{2}.
Units of pressure are: Pascals Atmospheres, mmHg, kg/m2, lbs/in2.

Units of _________ are: degrees Celsius, degrees Fahrenheit, degrees Kelvin.
Units of temperature are: degrees Celsius, degrees Fahrenheit, degrees Kelvin.

Changes in acoustic variables are the result of the mechanical interaction of the acoustic wave and the _____.
Changes in acoustic variables are the result of the mechanical interaction of the acoustic wave and the medium.

The propagation velocity has unit of _____ per _____.
The propagation velocity has unit of meters per second.

Units of _____ are mass/volume such as kg/m^{3}, and lbs/ft^{3}.
Units of density are mass/volume such as kg/m3, and lbs/ft3.

