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AP EAMCET Engineering 20 Apr 2019 Shift 2 Paper
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© examsnet.com
Question : 100
Total: 160
A siren placed at a railway platform is emitting a sound of frequency 5 kHz. A passenger sitting in a moving train ‘A’ records the frequency of the siren as 5.5 kHz. During his return journey by train ‘B' he records the frequency of the siren as 6 kHz. The ratio of the speed of train B to that of train A is
242
252
2
5
6
11
6
Validate
Solution:
The expression for the frequency of siren recorded by train A for observer A is,
f
A
=
f
s
(
v
s
+
v
A
v
s
)
Substitute values.
5.5
=
5
(
1
+
v
A
v
s
)
v
A
=
0.1
v
s
........(I)
The expression for the frequency of siren recorded by train B for observer B is,
f
B
=
f
s
(
v
s
+
v
B
v
s
)
6
=
5
(
1
+
v
B
v
s
)
v
B
=
0.2
v
s
.......(II)
From equation (I) and (II)
v
B
v
A
=
2
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