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CGPET 2018 Solved Paper
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© examsnet.com
Question : 32
Total: 150
A car, sounding a horn of frequency
1000
H
z
, is moving directly towards a huge wall at a speed of
15
m
∕
s
. If the speed of sound is
340
m
∕
s
, then the frequency of echo heard by the driver is
1046
H
z
954
H
z
1092
H
z
908
H
z
Validate
Solution:
Given, in this condition,
v
0
=
v
s
=
15
m
∕
s
Virtual frequency of sound source moving towards a huge wall,
n
′
=
(
v
v
−
v
s
)
n
.......(i)
The frequency of echo heard by driver,
n
"
=
(
v
+
v
0
v
)
n
′
From Eqs. (i) and (ii), we get
n
"
=
(
v
+
v
0
v
−
v
s
)
n
=
(
340
+
15
340
−
15
)
×
1000
≈
1092
H
z
© examsnet.com
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