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AP EAMCET Engineering 2011 Solved Paper
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© examsnet.com
Question : 30
Total: 160
In the Young's double slit experiment, the resultant intensity at a point on the screen is
75
%
of the maximum intensity of the bright fringe. Then the phase difference between the two interfering rays at that point is
π
6
π
4
π
3
π
2
Validate
Solution:
Given,
I
R
=
75
%
of
I
max
=
3
4
I
max
=
3
4
(
4
a
2
)
=
3
a
2
⇒
4
a
2
cos
2
ϕ
2
=
3
a
2
cos
2
ϕ
2
=
3
4
or
cos
ϕ
2
=
√
3
2
⇒
π
2
=
ϕ
6
or
ϕ
=
π
3
© examsnet.com
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