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Problem
Problem
About how many times more intense will the normal ear perceive a sound of
10
−
6
W
/
m
2
10^{-6} \text{ W}/\text{m}^2
1
0
−
6
W
/
m
2
than one of
10
−
9
W
/
m
2
10^{-9} \text{ W}/\text{m}^2
1
0
−
9
W
/
m
2
?
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