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Physics > Equations And Units > Flashcards

Equations And Units Flashcards

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1
Q

What is the equation for pressure

A

Pressure= force/area

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2
Q

What is the 2 units for pressure

A

N/m^2

Pascals (Pa)

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3
Q

What is the equation for density

A

Density=Mass/volume

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4
Q

What is the units for density

A

Kg/m^3

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5
Q

What is the equation for frequency

A

f=1/T

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6
Q

Units for frequency and for period

A

f= MHz

T=us

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7
Q

What is the equation for speed

A

Speed = distance/time

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8
Q

What is the equation for wavelength

A

Wavelength =c/f

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9
Q

What is the equation for propogation speed

A

Prop speed=. Square root (bulk modulus/density)

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10
Q

Unit for prop speed

A

Mm/us or m/s

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11
Q

What is the equation for pulse repetition frequency

A

PRF= 1/Pulse repetition period (PRP)

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12
Q

What is the units of pulse repetition frequency

A

kHz

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13
Q

What is the units for pulse repetition period

A

Ms

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14
Q

What is the equation for Pulse duration

A

PD=T x n

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15
Q

What is the unit for pulse duration

A

ms

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16
Q

What is the equation for duty factor

A

DF=PD/PRP

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17
Q

What is the unit for duty factor

A

% or decimal

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18
Q

What is the equation for spatial pulse length

A

SPL= wavelength x n

19
Q

What is the unit of power

A

Milliwatt (mW)

20
Q

What is the unit for intensity?

A

.mW/cm^2

21
Q

What is the equation for intensity?

A

intensity = power /area

22
Q

What is the equation for intensity regarding just amplitude

A

Intensity = amplitude^2

23
Q

Operating frequency

A

Max f + min f)/2

24
Q

Fractional bandwidth

A

Bandwidth/ fo

25
Q

Quality factor

A

Fo/bandwidth

26
Q

Units for fractional bandwidth

A

% or .

27
Q

Equation from breakdown of attenuation

A

DB= adB + bdB +cdB

28
Q

Attenuation formula

A

…. a = ac x L

29
Q

Unit of attenuation

A

DB

30
Q

Unit of attenuation coefficient

A

….dB/cm

31
Q

Ac is = to

A

1/2 Operational frequency

32
Q

FOR THE HALF VALUE LAYER USE THE ____ EQUATION AND WHAT IS ALREADY KNOWN

A

Use the attenuation equation and attnuation is already known (3 dB)

33
Q

Ratio for finding HVL

A

15 db/1 cm =3dB/ x

34
Q

Intensity reflection coefficient

A

IRC= echo intensity/incident sound intensity x 100

35
Q

Unit of IRC

A

%

36
Q

What equalls 100%

A

Intensity reflection coefficient(IRC) + (intensity transmission coefficient (ITC)

37
Q

Equation for impedance

A

Z= density x speed

38
Q

Rayls =

A

Kg/m3 x m/s

39
Q

Net impedance

A

Delta z = z1-z2

40
Q

equation of IRC

A

IRC =[(z2-z1)/(z2+z1)]2

41
Q

Finding angle or speed of oblique incidence

A

C1/co1 = c2/co2

42
Q

Range with Round trip time

A

D=(0.5 x t) / c (in us/cm unit)

43
Q

Regular range

A

D = v x T

Physics (32 decks)

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