PPT Slide
Electric field intensity at point P,
E
p
E
p
=
E
1
+
E
2
=
E
0
sin
w
t
+
sin
w
t
+
f
(
)
(
)
=
2
E
0
cos
f
2
Amplitude
1
2
4
3
4
sin
w
t
+
f
(
)
f
=
0
,
2
p
,
K
Û
constructive interference
f
=
p
,
3
p
,
K
Û
destructive interference
Intensity I of combined wave
I
µ
E
p
2
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