Chapter 3 Describing sound waves

If frequency decreases, wavelength

increases

decreases

remains unchanged

depends on the propagation speed

Increases

What is the equation for wavelength

period/frequency

SPL/frequency

propagation speed/frequency

propagation speed/period

Propagation speed/ frequency

Propagation speed is determined by

sound source

medium

sound source and medium

frequency

Medium

Which of the following frequencies is in the range of ultrasound

15 kHz

0.2 MHz

200 Hz

0.01 MHz

0.2 MHz

If stiffness increases, propagation speed

increases

decreases

depends on depth

depends on pressure

Increases

With standard ultrasound imaging, what happens to period as a wave propagates

increases

decreases

refracts

remains the same

Remains the same

In soft tissues, sound with a frequency of 2MHz has a wavelength of

.88mm

.65mm

1.54mm

.77mm

.77 mm

Time it takes to complete a single cycle

wavelength

frequency

intensity

period

Period

Power, amplitude, and intensity are

determined by the sound wave and medium and cannot be changed

determined by the sound source but can be changed

determined by the medium only but can be changed

determined by the medium and strength of the wave and cannot be changed

determined by the sound source but can be changed

If the power in a beam is doubled but intensity remains the same, what else must be true

frequency is halved

beam area is doubled

wavelength is doubled

frame rate increases

Beam area is doubled

The wavelength for high frequency waves is ___________than lower frequency waves

longer

shorter

deeper

frequency does not affect wavelength

Shorter

If frequency doubles, period

doubles

halves

remains unchanged

depends on propagation speed

Halves

Which of the following is not a parameter of sound waves

power

wavelength

period

pressure

Pressure

What two terms are opposite of stiffness

squishability and compressibilitly

elasticity and bulk modulus

compressibility and elasticity

hardness and compressibility

compressibility and elasticity

What are the units for wavelength

meters/second

millimeters

hertz

second

Millimeters

Propagation speed is determined by the

medium only

medium and sound source

sound source

power, amplitude, and intensity of the wave

medium only

Per second is defined as

hertz

period

cycle

pascal

hertz

What are the parameters that describe the strength of a sound wave

frequency, period, wavelength

power, amplitude, intensity

pressure, density, distance

PRF, PRP, duty factor

power, amplitude, intensity

Put the following in order from fastest to slowest propagation speed

liver, lung, fat, bone

fat, liver, lung, bone

bone, liver, fat, lung

bone, lung, liver, fat

bone, liver, fat, lung

Beam area and intensity are

directly related

inversely related

unrelated

obliquely related

inversely related