IL = 10 log (I/I
0
)
where I
0
= 10
-12
W/m
2
118 = 10 log (I/10
-12
log (I/10
-12
) = 11.8
I/10
-12
= 6.3X10
11
I = 0.63 W/m
2
Return to Self Test 4