Formulas Flashcards
1
Q
Period formula
A
T (microseconds) = 1/f(MHz)
2
Q
Wavelength formula
A
lamda (mm) = c (mm/microseconds)/ f (MHz)
3
Q
PRP formula
A
PRP (ms) = 1/PRF (kHz)
4
Q
PD formula
A
PD (microseconds) = n x T (microseconds)
5
Q
DF
A
PD (microseconds)/PRP (microseconds)
6
Q
Intensity formula
A
I (mW/cm^2) = P (mW)/A (cm^2)
Power/area
(amplitude)^2/area
7
Q
attenuation formula
A
a (dB) = attenuation coefficient (dB/cm) x L (cm)
a (dB) = 0.5(dB/cm-MHz) x f (MHz) x L (cm)
8
Q
3 dB corresponds to an intensity ratio of __ aka an intensity reduction of __.
A
one-half; 50%
9
Q
10 dB corresponds to an intensity ratio of ___ aka an intensity reduction of __.
A
one-tenth; 90%
10
Q
Impedance formula
A
z (rayls) = p (kg/m^3) x c (m/s)
