AP Precalculus Quiz
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EXPONENTIAL AND LOGARITHMIC FUNCTIONS
Question 1
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Sound level is
L
=
10
log
10
(
I
10
−
12
)
L=10\log_{10}\!\left(\tfrac{I}{10^{-12}}\right)
L
=
10
lo
g
10
(
1
0
−
12
I
)
dB. If
L
=
70
L=70
L
=
70
dB, determine the intensity
I
I
I
in
W
/
m
2
\text{W}/\text{m}^2
W
/
m
2
.
A
I
=
10
−
5
W
/
m
2
I=10^{-5}\,\text{W}/\text{m}^2
I
=
1
0
−
5
W
/
m
2
B
I
=
7
×
10
−
12
W
/
m
2
I=7\times 10^{-12}\,\text{W}/\text{m}^2
I
=
7
×
1
0
−
12
W
/
m
2
C
I
=
10
7
W
/
m
2
I=10^{7}\,\text{W}/\text{m}^2
I
=
1
0
7
W
/
m
2
D
I
=
10
−
19
W
/
m
2
I=10^{-19}\,\text{W}/\text{m}^2
I
=
1
0
−
19
W
/
m
2
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