P18_028.PDF
(
62 KB
)
Pobierz
Chapter 18 - 18.28
28. (a) The intensity is
P
4
πr
2
30
.
0W
(4
π
)(200 m)
2
I
=
=
=5
.
97
×
10
−
5
W
/
m
2
.
(b) Let
A
(= 0
.
750 cm
2
) be the cross-sectional area ofthe microphone. Then the power intercepted by
the microphone is
P
=
IA
=0=
6
.
0
×
10
−
5
W
/
m
2
0
.
750 cm
2
10
−
4
m
2
/
cm
2
=4
.
48
×
10
−
9
W
.
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Inne pliki z tego folderu:
P18_003.PDF
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P18_004.PDF
(58 KB)
P18_001.PDF
(61 KB)
P18_002.PDF
(62 KB)
P18_005.PDF
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Inne foldery tego chomika:
chap01
chap02
chap03
chap04
chap05
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