Sound Waves Flashcards
What term is used to describe the effects of an ultrasound wave on living tissue?
a. toxic effects
b. acoustic propagation properties
c. biological effects
d. transmission properties
c. biological effects
As sound travels through a medium, what term describes the effects of the medium on the sound wave?
a. toxic effects
b. acoustic propagation properties
c. bio effects
d. transmission properties
b. acoustic propagation properties
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. all carry energy from one site o another
Which of the following types of waves do not require a medium in order to propagate? (More than one answer may be correct).
a. light
b. heat
c. sound
d. television
a. light
b. heat
d. television
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. mechanical, longitudinal
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. a series of compressions and rarefactions
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. they are transverse
Which of the following 8 selections are acoustic variables? (True or False?)
a. frequency
b. pressure
c. propagation speed
d. wavelength
e. voltage
f. intensity
g. motion of particles in the wave
h. density
a. False
b. True
c. False
d. False
e. False
f. False
g. True
h. True
What are the units of a pressure measurement of an acoustic wave? (more than one answer may be correct).
a. atmospheres (atm)
b. pascals (Pa)
c. millimeters of mercury (mmHg)
d. pounds/sq. inch (lb/in^2)
a. atmospheres (atm)
b. pascals (Pa)
c. millimeters of mercury (mmHg)
d. pounds/sq. inch (lb/in^2)
Sound can be characterized as:
a. energy flowing through a vacuum
b. a variable
c. cyclical oscillations in certain variables
d. a principle of acoustics
c. cyclical oscillations in certain variables
Match the 3 acoustic variables, pressure, density, and particle motion with their correct units. (more than one answer may be correct).
a. lb/in^3
b. Fahrenheit degrees
c. miles
d. Pa
e. cm
f. Centigrade degrees
g. lb/in^2
h. kg/m^3
Pressure: d. & g.
Density: a. & h.
Particle motion: c. & e.
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 the original
b. one third of the original
c. six times more than the original
d. unchanged
d. 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 to 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 and then from north to south
b. alternately from east to west and then from west to east
The direction of motion of a particle in a wave is perpendicular to the direction of propagation of the wave. What type of wave is this?
a. longitudinal
b. acoustic
c. mechanical
d. transverse
d. transverse
A particle within a transverse wave is traveling vertically. What is the direction of the wave’s propagation?
a. horizontal
b. vertical
c. diagonal; both horizontal and vertical
d. cannot be determined
a. horizontal
