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PASS BOOK
Elementary Principles ch 1
23
Physics
Undergraduate 2
10/24/2015

Additional Physics Flashcards

 


 

Cards

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
Quadrupled
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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