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BITSAT 2022 Solved Question Paper
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© examsnet.com
Question : 2
Total: 130
In a resonance column first and second resonance are obtained at depths
24
cm
and
78
cm
the third resonance will be obtained at depth.
160
cm
132
cm
131
cm
152
cm
Validate
Solution:
👈: Video Solution
Given, first resonance column at deoth,
l
1
=
24
c
m
Second resonance column at depth,
l
2
=
78
c
m
Third resonance column at depth,
l
3
=
?
A
s
l
1
+
x
=
λ
4
=
24
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
(
i
)
l
2
+
x
=
3
λ
4
=
78
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
(
i
i
)
l
3
+
x
=
5
λ
4
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
(
i
i
i
)
From Eqs. (i) and (ii),
x
=
l
2
−
3
l
1
2
=
78
−
3
(
24
)
2
=
3
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
(
i
v
)
substituting
l
1
and
x
value, we get
l
3
=
5
(
24
)
+
4
(
3
)
⇒
l
3
=
132
c
m
.
© examsnet.com
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