# Shared Flashcard Set

## Details

PASS BOOK
Elementary Principles ch 1
23
Physics
10/24/2015

Term
 The audible range of sound is:
Definition
 > 20 Hz but < 20,000 Hz
Term
 Transducer frequency is directly oportional to :
Definition
 Sound intensity
Term
 The term used to describe the number of cycles that occur in a one-second time period is:
Definition
 frequency
Term
 _____ is not considered as an acoustic variable.
Definition
 Intensity
Term
 What two characteristics of a medium determine it's propagation speed?
Definition
 Density and Stiffness
Term
 If the density of a medium increases. the speed of sound will :
Definition
 Decrease
Term
 If the intensity of a signal is doubled, what is the affect on amplitude:
Definition
Term
 The rate at which work is done is referred to as:
Definition
 Power
Term
 _____ is the rate of work.
Definition
 Power
Term
 The % of time the sound is on is referred to as :
Definition
 Duty Factor
Term
 A 6dB gain would indicate an increase in intensity of _____ times.
Definition
 4
Term
 The log of 10,000 is equal to :
Definition
 4
Term
 Intensity depends upon both:
Definition
 Power and Beam Area
Term
 If the initial is 40 and there is a 3db gain the final intensity is :
Definition
 80
Term
 The speed of sound in tissue is:
Definition
 1.54 mm/μs
Term
 Wavelength is determined by what factors:
Definition
 Sound Source and Medium
Term
 If the stiffness of a medium increases, the propagation speed will :
Definition
 Increase
Term
 Propagation speed is higher through:
Definition
 Bone
Term
 A complete cycle consists of one compression and one rarefraction. The area of low pressure and density is referred to as :
Definition
 Rarefraction
Term
 Frequency = Hz   Wavelengths = mm   Intensity = mW/cm²   Propagation Speed = mm/μsec
Definition
 Mega = Micro   Kilo = Milli   Hecto = Centi   Deca = Deci
Term
 At one (1) half intensity depth:
Definition
 the initial intensity was halved
Term
 As an ultrasound wave travels through the body, its intensity usually:
Definition
 Decreases
Term
 The greatest intensitiy for a pulsed beam of sound?
Definition
 SPTP
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