Decibels Flashcards
1
Q
Log 1 = Log 2 = Log 3 = Log 8 = Log 16 = Log 32 =
A
0 .3 .6 .9 1.2 1.5
2
Q
Intensity =
A
10log Ix/Iref
3
Q
Pressure =
A
20 log Px/Pref
4
Q
Intensity unit of measure =
A
dBIL
5
Q
Pressure unit of measure
A
dBSPL
6
Q
Sound A is ________ as intense as sound B
Provide formula:
A
10log X/1
7
Q
Sound A has X pressure level as sound B
Provide equation:
A
20logX/1
8
Q
Watts/ _____(2)
A
Meter
9
Q
Dynes/_____(2)
A
Cm
10
Q
Watts/m2 “absolute value”
Equation:
Sound A is 10(X)
Re: 10(-12)
A
10log(10(x)/10(-12))
11
Q
Dynes/cm2
Sound A is 2 dynes/cm2
Absolute value
Re: .0002 dynes/cm2
A
20log2/.0002
12
Q
Decibels =
A
Relative measure / “absolute” physical units
13
Q
Reference point =
A
Arbitrary ref point in units of pressure
