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BITSAT 2022 Solved Question Paper
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© examsnet.com
Question : 3
Total: 130
A submarine
A
travelling at
17
m
s
is being chased along the line of its velocity by another submarine
B
travelling at
34
m
s
. B sends a sonar signal of
600
H
z
to detect
A
and receives a reflected sound of frequency
v
. The of
v
is
[Speed of sound in water
=
1500
ms
−
1
]
613.7
Hz
6137
Hz
62
Hz
539
Hz
Validate
Solution:
👈: Video Solution
Given, velocity of submarine
A
,
v
A
17
m
∕
s
Velocity of Submarine
B
,
v
B
=
34
m
∕
s
Signal sent by submarine B is detected by submarine
A
can be shown as
Frequency of the signal,
f
0
=
600
H
z
speed of sound in water
v
s
=
1500
m
s
−
1
Frequency received by submarine
A
is
f
1
=
(
v
S
−
v
A
v
S
−
v
B
)
f
0
=
[
1500
−
17
1500
−
34
]
×
600
h
z
f
1
=
1483
1466
×
600
.
.
.
.
.
.
.
.
.
.
.
.
(
i
)
Frequency received by submarine is
f
2
=
(
v
S
+
v
B
v
s
v
A
)
f
1
Substituting given values and
f
1
value from Eq. (i), we get
f
2
=
(
1500
+
34
1500
+
17
)
×
[
1483
1466
×
600
]
f
2
=
1.0112
×
1.0115
×
600
f
2
=
613.7
H
z
.
© examsnet.com
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