Exam 1 Flashcards
Unrelated
Two items not associated
Ex) temperature is unrelated to the day of the week
Related/proportional
Two items that are associated but relationship doesn’t need to be specified
Ex) weight is related to dieting
Santa is related to Christmas
Directly related/ directly proportional
Two items are associated (when one increases the other increases - both go the same way)
Ex) clothing size is directly related to ones weight
Skill is directly proportional to practice
Quality of wine is directly related to age
Inversely related/ proportional
Two items are associated but one item increases while the other item decreases
Ex) golf score is inversely related to skill
A car’s gas mileage is inversely related to its engine size
Reciprocal relationship
When two numbers with a reciprocal relationship are multiplied and the answer is 1
1/2 x 2 = 1
____ make a numerical answer comprehensive
Units
How many lbs in a liter?
2.2 lbs = 1 liter
Increase by a factor means
Multiply by that number
Decrease by a factor means
Divide by that number
A number followed by the word “percent” is ____.
Unitless
Are reciprocal numbers inverse?
Yes, bc when one increases, the other decreases
Name two reciprocals
Period and frequency
Units of length
Distance or circumference: cm or ft
What are units of area
Cm^2 or ft^2
Units of volume?
Cm^3 or ft^3
How many cm in 1 inch?
2.54 cm = 1inch
A number in scientific notation form with a negative exponent has a value of ___
Less than one
A number is scientific notation form with an exponent of zero has a value btw ___?
1 and 10
A number in scientific notation form with a positive exponent has a value of ____?
Greater than 10
What is a sound/acoustic wave?
- It carries energy
- sound is a mechanical wave
- it can’t travel through a vacuum, must travel through a medium
- they can be compressed and rarefied
- sound travels in a straight line
- sound waves are longitudinal
What is media?
Biologic tissue
What does compressed and rarefied mean?
Compressed- pressed down
Rarefied- stretched
The effects of the medium upon the sound wave
Acoustic propagation properties
The effects of the sound wave upon the biologic tissue through which it passes
Biologic effects
What are the 3 acoustic variables and what are their units?
Pressure= Pa (pascals) force/ area
Density= (kg, cm^3) mass/volume
Distance= (cm, ft, mile) measure of particle motion
Define pressure
Concentration of force in an area
Define density
Concentration of mass in a volume
Define distance
Measure of a particle motion
10^9
Giga - billion
G
10^6
Mega - million
M
10^3
Kilo - thousand
k
10^2
Hecto- hundred
h
10^1
Deca - ten
da
10^-1
Deci- tenth
d
10^-2
Centi - hundredth
c
10^-3
Milli - thousandth
m
10^-6
Micro - millionth
u
10^-9
nano - billionth
n
In reference to the metric system, what is an example of a reciprocal?
Giga and nano
-billion and billionth
Mega and micro
-million and millionth
Sound waves are also known as
Acoustic waves
What are 7 acoustic parameters? (Must be in order)
Period Frequency Amplitude Power Intensity Wavelength Propagation speed
(Parents Frequently Act Powerful in Waves)
What is a transverse wave?
Particles move in a direction that is perpendicular to the direction that the wave propagates (UP AND DOWN)
What is a longitudinal wave?
Particles move in the same direction that the wave propagates (LEFT TO RIGHT)
What type of wave is sound?
Longitudinal
What is an in-phase wave?
When their peaks occur at the same time and at the same location (in step with one another)
Define constructive interference
When two in phase waves come together, resulting in one larger wave
Destructive interference
When two destructive waves come together resulting in a one smaller wave
What happens when out of phase waves with equal amplitude come together?
They may cancel each other out
What happens when the frequencies of the waves differ?
Both constructive and destructive interference occurs
mm= ___
Millimeters= CC (cubic centimeters)
10mm=
1cm
One example of why graphs are used?
To show the velocity of blood
