Formulas

Question 1

Period formula

Answer 1

T (microseconds) = 1/f(MHz)

Question 2

Wavelength formula

Answer 2

lamda (mm) = c (mm/microseconds)/ f (MHz)

Question 3

PRP formula

Answer 3

PRP (ms) = 1/PRF (kHz)

Question 4

PD formula

Answer 4

PD (microseconds) = n x T (microseconds)

Question 5

DF

Answer 5

PD (microseconds)/PRP (microseconds)

Question 6

Intensity formula

Answer 6

I (mW/cm^2) = P (mW)/A (cm^2)
Power/area
(amplitude)^2/area

Question 7

attenuation formula

Answer 7

a (dB) = attenuation coefficient (dB/cm) x L (cm)

a (dB) = 0.5(dB/cm-MHz) x f (MHz) x L (cm)

Question 8

3 dB corresponds to an intensity ratio of __ aka an intensity reduction of __.

Answer 8

one-half; 50%

Question 9

10 dB corresponds to an intensity ratio of ___ aka an intensity reduction of __.

Answer 9

one-tenth; 90%

Question 10

Impedance formula

Answer 10

z (rayls) = p (kg/m^3) x c (m/s)