Equations And Units Flashcards
What is the equation for pressure
Pressure= force/area
What is the 2 units for pressure
N/m^2
Pascals (Pa)
What is the equation for density
Density=Mass/volume
What is the units for density
Kg/m^3
What is the equation for frequency
f=1/T
Units for frequency and for period
f= MHz
T=us
What is the equation for speed
Speed = distance/time
What is the equation for wavelength
Wavelength =c/f
What is the equation for propogation speed
Prop speed=. Square root (bulk modulus/density)
Unit for prop speed
Mm/us or m/s
What is the equation for pulse repetition frequency
PRF= 1/Pulse repetition period (PRP)
What is the units of pulse repetition frequency
kHz
What is the units for pulse repetition period
Ms
What is the equation for Pulse duration
PD=T x n
What is the unit for pulse duration
ms
What is the equation for duty factor
DF=PD/PRP
What is the unit for duty factor
% or decimal
What is the equation for spatial pulse length
SPL= wavelength x n
What is the unit of power
Milliwatt (mW)
What is the unit for intensity?
.mW/cm^2
What is the equation for intensity?
intensity = power /area
What is the equation for intensity regarding just amplitude
Intensity = amplitude^2
Operating frequency
Max f + min f)/2
Fractional bandwidth
Bandwidth/ fo
Quality factor
Fo/bandwidth
Units for fractional bandwidth
% or .
Equation from breakdown of attenuation
DB= adB + bdB +cdB
Attenuation formula
…. a = ac x L
Unit of attenuation
DB
Unit of attenuation coefficient
….dB/cm
Ac is = to
1/2 Operational frequency
FOR THE HALF VALUE LAYER USE THE ____ EQUATION AND WHAT IS ALREADY KNOWN
Use the attenuation equation and attnuation is already known (3 dB)
Ratio for finding HVL
15 db/1 cm =3dB/ x
Intensity reflection coefficient
IRC= echo intensity/incident sound intensity x 100
Unit of IRC
%
What equalls 100%
Intensity reflection coefficient(IRC) + (intensity transmission coefficient (ITC)
Equation for impedance
Z= density x speed
Rayls =
Kg/m3 x m/s
Net impedance
Delta z = z1-z2
equation of IRC
IRC =[(z2-z1)/(z2+z1)]2
Finding angle or speed of oblique incidence
C1/co1 = c2/co2
Range with Round trip time
D=(0.5 x t) / c (in us/cm unit)
Regular range
D = v x T