Acoustic physics review ch 1-3

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The poll's duration is one millisecond and the pulse Repetition period is 1 second.The duty factor is

0.1%

1,000,000=

1.0 x 10^6 106

0.000000124=

1.24 x 10^-7

1742=

1.742 x 10^3

How much bigger is a giga- than a kilo-

1/1,000,000

The speed of sound in soft tissue

1540 m/s or (1.54 mm/us)

How many milliliters are in three point 3.87 liters

3,870

Transducer travels through Air

330 m/sec

bone is

3500 m/sec

A 6MHZ Continuous wave has a propagation speed of 6km/s. The wave is then pulsed with a duty factor of 0.5. The New propagation speed is

6km/s

Piezoelectric effect

Converting one form of energy into another from an electrical wave to a mechanical wave upon transmission reception is from mechanical to electricals

audible sound

The range of human hearing between 20Hz- 20,000hz or 20Hz-20khz

Waves propagate from place to place by

Transfer of energy

Peak measurements of intensity are lower than the average measurement

false

intensities have Different measurements to help in the study of the bio effects of ultrasound

false

Which of the following Is in correct order from largest to smallest

giga,mega,kilo,centi

Which of the following is incorrect order from smallest to largest

micro,killo,mega

If I begin an exam using a 2.0 MHz transducer and the next exam requires using a 7.0MHZ transducer, what will happen to my period? wavelength?

they decrease

What is the relationship between frequency and waveling

they have an inverse relationship ( We see better because we are closer to the structure)

axis of waveform

time and amplitude perpendicular

Pulse repetition frequency and pulse repetition period are directly proportional to each other

true

Units for intensity are

watts/sq-cm

in phase waves

when the peaks (maximum values) and troughs (minimum values) of a pair of waves occur at the same time and at the same location

What is the relationship between frequency and axial resolution

direct (meaning an increase in frequency or high frequency(5.0,7.0,10.0) Will increase axial resolution

definition of sound

A longitudinol mechanical wave

Transverse waves

A wave in which the particles of the medium move perpendicularly to the direction the wave is traveling

Ultrasound

Above the audible range of human hearing ultrasound is above 20khz or 20,000hz

Some waves are. Identified by three

Acoustic variables

Sound waves are characterized by seven

Acoustic variables

Infrasound

Below the audible range of human hearing and for sound is below 20hz

frequency of 2.0-2.5 are?

Deep structures increasing the depth and decreasing the axial resolution

Which of the following is not an acoustic parameter

Density

Molecules in the media through which a sound wave propagates vibrate in the direction of propagation

False

Sound waves are typically transverse waves

False

frequency 5.0-7.0-10.0 are

For surface structures that decrease the depth and increase the axial resolution

Constructive interference

In faceway from a single wave of greater amplitude than either of its components the resulting wave is larger

Destructive interference

Out of phase way from a single wave of lesser amplitude than at least one of its components. Resultant wave is smaller.

Out of face waves

Peak Occur at different times

Formula for propagation Speed

Speed (m/s) = frequency (Hz) x wavelength (m) mm=1.54mm/us

How do I change my amplitude and intensity

Use output power

Formula for wavelength

Wavelength = speed/frequency

When using high frequency resolution aka: ( superficial, surface structures, our bean scanned).

You receive less death penetration but improve axial resolution. "we see better because we are closer"

How much smaller is a nano than a milli

a million times

longitudinal wave

a wave in which the particles of the medium vibrate parallel to the direction of wave motion.

What are seven acoustic parameters

period, frequency, amplitude, power, intensity, wavelength, propagation speed

Formula for frequency

speed/wavelength


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