Chapter 2 Sound Waves Flashcards by Amaris Baile

What do waves transfer from one location to another?
A: matter
B:molecules
C: energy
D: water

C: energy (waves carry energy from place to place )

How well did you know this?

Not at all

Perfectly

Which of the following best describe sound waves?
A: a series of compression and rare fraction
B: waves that are heard by man
C: movement of molecules and energy from one location to another
D: waves that are used to make images of anatomy

A: a series of compression and rare fraction

How well did you know this?

Not at all

Perfectly

Which of the following term does not belong with the others?
A:compression
B:region of high density
C: region of high pressure
D: wide molecular spacing

D: wide molecular spacing

How well did you know this?

Not at all

Perfectly

Variations in all of the following identify specific waves as acoustic waves except:
A: pressure
B: parameters
C: density
D: acoustic variables

B: parameters

How well did you know this?

Not at all

Perfectly

All of the following are true of sound waves except :
A: they are acoustic
B: they are pressure waves
C: they are transverse waves
D: they move energy

C: they are transverse waves ( waves are longitudinal waves )

How well did you know this?

Not at all

Perfectly

All of the following are acoustic parameters except
A:pressure
B:period
C:propagation speed
D: frequency

A:pressure ( pressure is an acoustic variable )

How well did you know this?

Not at all

Perfectly

Which of the following best describes sound waves ?
A: transverse , pressure waves
B: transverse , longitudinal waves
C: longitudinal, out-of phase waves
D: longitudinal , pressure waves

D: longitudinal, pressure waves

How well did you know this?

Not at all

Perfectly

Two waves are traveling in a medium and arrive at a location at the same time. Which event takes place?
A: constructive interference
B: destructive interference
C: interference
D:reflection

C: interference

How well did you know this?

Not at all

Perfectly

Which type of waves will exhibit both constructive and destructive interference?
A:waves of different amplitude
B: a pair of longitudinal waves
C: waves of different frequency
D: out -of-phase waves

C: waves of different frequency ( both constructive and destructive interference occurs with waves with different frequencies)

How well did you know this?

Not at all

Perfectly

What units are used to report the pressure of a sound beam?
A:pounds
B:centimeters
C: pascals
D: kg/cm

C: pascals (pressure is appropriately reported with units of pascals abbreviated Pa)

How well did you know this?

Not at all

Perfectly

True or false? Acoustic there was allow us to determine which waves are sound waves, and which are not.

True

How well did you know this?

Not at all

Perfectly

True or false? acoustic parameters are used to describe the features of sound waves

True

How well did you know this?

Not at all

Perfectly

What kind of wave is a sound wave ?

Sound waves are mechanical waves that travel through a medium

How well did you know this?

Not at all

Perfectly

7 paramaeters

Period
Frequency
Amplitude
Power
Intensity
Wavelength
Propagation speed

How well did you know this?

Not at all

Perfectly

Three acoustic variables and the units

1:Pressure (units :pascals Pa) (concentration of force in an area )
2: Density (units kg/cm3 ) (concentration of mass in a volume)
3: Distance (units cm, feet, mile ) (measure of particle motion)

How well did you know this?

Not at all

Perfectly

Transverse waves

Particles move in a direction that is perpendicular (at right angles) to the direction of the wave propagates

How well did you know this?

Not at all

Perfectly

Longitudinal waves

Particles move in the same direction that the wave propagates.

In-phase waves are when the peak of two waves ?

In waves waves, where to leaves peak (maximum value) occur at the same time and at the same location

Out of phase waves occur when ? ( think out of step waves )

Out of phase phrase occur when their peaks occur at different times

Constructive waves are

Constructive waves are in-phase- waves results in the formation of a single wave of greater amplitude than either of its components (these out come of the wave results in a wave larger than either component )

Destructive interference waves are

Destructive interference is a pair of out-of-phase waves that result in formation of a single wave with lesser amplitude then one of the components

Interference of waves with different frequencies

Combination of in and out of phase waves

What term is used to describe the effects of an ultrasound wave o living tissues ?
A: toxic effects
B: acoustic propagation properties
C: biological effects
D: transmission properties

C: the effects of ultrasound on the tissues are called biological effects or bioeffects. There have been no confirmed bioeffects on humans with acoustic intensities typical of those used in diagnostic

As sound travels through a medium, what term describes the effects of the medium on the sound waves?
A:toxic effects
B: acoustic propagation properties
C: bioeffeccts
D:transmission properties

B: Acoustic propagation properties describes the effects of the medium on the waves traveling through it. Acoustic means “sound.” Propagation means “to travel”.

Which of the following is true of all waves? A: they travel through a medium B: all carry energy from one site to another C: their amplitudes do not change D: they travel in a straight line

(B: Waves carry energy from on place to another. ) A : incorrect because some waves, such as light can travel through a vacuum. C: is incorrect because many waves get weaker as they travel in a straight line D: is incorrect because waves do not travel in a straight line

Which of the following types of waves do not require a medium in order to propagate? (More than one answer ay be correct) A: light B: heat C: Sound D: television

A, B D Sound cannot travel through a vacuum: it requires a medium in order to propagate. other waveforms such as light, heat and TV waves are capable of traveling through a vacuum

Which of the following describes the characteristics of a sound wave? A: longitudinal, non-mechanical B: mechanical, transverse C: transverse, acoustic D: mechanical, longitudinal

D: sound is a mechanical, longitudinal wave. A mechanical wave, such as sound actually imparts energy to the molecules of the medium through which it travels. The molecules of the medium through which it travels. The molecules of the medium vibrate, striking their neighbors, which in turn vibrate. This chain reaction results in the acoustic energy traveling through the medium

Sound is best described as A: a series of compressions and rarefactions B: a transverse wave C: a wave that humans can hear D: an oblique displacement of acoustic energy

A: sound is composed of a series of compressions and rare fractions. Molecules in the medium are alternately squeezed together (compressed) and stretched apart (rare field)

All of the following are true about sound waves except A: they are mechanical B: they are transverse C: they carry energy from place to place D: they generally travel in a straight line

B: sound waves are not transverse, they are longitudinal

Which of the following 8 selections are acoustic variables ( True or False) Frequency Pressure Propagation speed Wavelength Voltage Intensity Motion of particles in a wave Density

Frequency (false) Pressure (true) Propagation speed (false) Wavelength (false) Voltage (false) Intensity (false) Motion of particles in a wave (true) Density (true ) (Acoustic variables identify certain wave as sound waves. These quantities are pressure, density and particle motion)

What are the units of a pressure measurements of an acoustic wave? (More than one answer may be correct) A: atmospheres (atm) B: pascals (Pa) C: millimeters of mercury (mm Hg) D: pounds /sq. Inch (lb/in2)

A, B, C, D ( All of these terms are appropriate to represent pressure )just as weight can be reported with units of pounds, ounces, tons, or grams). However, the pressure of sound waves is most often reported in in units of pascals

Sound can be characterized as: A: energy following through a vacuum B: a variable C: cyclical oscillations in certain variables D: a principle of acoustic

C: Sound is a wave. A wave is the rhythmical variation throughout time

What the units for the 3 acoustic variables (Pressure, Density, particle motion )

Pressure: Pa (pascals ) , and pounds per square inch (lb/ in 2 ) Density: pounds per square inch (lb/ in 2) and kg/m3 Particle motion: miles and cm

A force is applied to a surface. If the force is tripled and the surface area over which the force is applied is also tripled, what is the new pressure? A: three times larger than your original B: one third of the original C: six times more than original D: unchanged

D: pressure is defined as an amount as an amount of force divided by the area to which it is applied. If the applied force is tripled, and at the same time, the area over which it is applied is tripled, then the pressure remains unchanged

A longitudinal wave propagates from east to west at a speed of 2 miles per hour. What is the direction of motion of the particles within the wave? A: from east o west only B: alternately from east to west and then from west to east C: from north to south only D: alternately from south to north

A: longitudinal waves is defined as a wave whose particles vibrate back and forth in the same direction that the wave is propagating

The direction of motion of a particle in a wave is perpendicular to the direction of propagation of the wave. What the of wave is this? A: longitudinal B; acoustic C; mechanical D: transverse

D: a characteristic of transverse waves is that the direction of propagation is perpendicular to the direction of particle motion in the wave.

A particle within a transverse wave is traveling vertically. What is the direction of the waves propagation? A: horizontal B: vertical C: diagnostic; both horizontal and vertical D: cannot be determined

The particles within a transverse waves travel in a direction that is perpendicular to the direction of propagation of the weave

Waves that exist at the same location and time will combine.. What is this called? A: interence B: rarefaction C: interference D: longitudinal interaction

C: the combination of many waves into a single wave is called interference

Two waves arrive at the same location and interfere. The reluctant sound wave is small than either of the two original waves. What is this called? A: constructive interference B: angular interaction C: destructive interference D: in-phase waves

C: Destructive interference results when a pair of out0of-phase waves interfere with each other

A pair of waves are in phase. What occurs when these waves interfere? A: reflection B: constructive C: refraction D: destructive interference

B: Waves that are in phase constructively interfere with each other.