Lecture 1 - Physics In Ultrasound Flashcards
A shorthand method
Scientific notation
A non-zero # written in scientific notation has the form:
N x 10^k
The raise number is called the
Exponent
The number 10 is the
Base
A number GREATER THAN TEN
Positive exponent
A number LESS THAN ONE
Negative exponent
A numver between one and ten will have an exponent of
ZERO
10(18)
Exa - E
10(15)
Peta - P
10(12)
Tera - T
10(9)
Giga - G
10(6)
Mega - M
10(3)
Kilo - K
10(2)
Hecto - H
10(1)
Deca - da
10(-1)
Deci - d
10(-2)
Centi - C
10(-3)
Milli - m
10(-6)
Micro - u
10(-9)
Nano - n
10(-12)
Pico - p
10(-15)
Femto - f
10(-18)
Atto - a
Every measurement has 2 parts
Magnitude & unit
• 100 cm
100 - magnitude
cm - unit of measurement
Unit of length:
kilometer (km)
meter (m)
centimeter (cm)
- is the perimeter of circle & is also expressed as a unit of length (mm, cm or m)
- a distance
Circumference
units of area
square meter (m2) square centimeter (cm2)
Units of volume
Cubic meter (m3) Cubic millimeter (mm3)
Units of time:
Seconds (s)
Milliseconds (ms)
Units of speed:
Meters per second (m/s)
Millimeters per microsecond (mm/us)
Unit of power
Watts (W)
Unit of work
Joule (J)
Unit of Acoustic Impedance
rayls
