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AP and TS EAMCET Engineering Model Paper 20
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© examsnet.com
Question : 103
Total: 160
When a train approaches a stationary observer, the apparent frequency of whistle is
n
1
. When same train recedes away from the observer, the apparent frequency is
n
2
Then frequency received by an observer moves along with the train is
n
1
+
n
2
2
√
n
1
n
2
2
n
1
n
2
n
1
+
n
2
2
n
1
n
2
n
1
−
n
2
Validate
Solution:
n
1
=
n
(
v
v
−
v
s
)
∴
v
−
v
s
=
n
v
n
1
.......(1)
n
2
=
n
(
v
v
+
v
s
)
∴
v
+
v
s
=
n
v
n
2
.......(2)
(1)
+
(
2
)
gives
2
v
=
n
v
(
1
n
1
+
1
n
2
)
=
n
v
(
n
1
+
n
2
n
1
n
2
)
or
n
=
2
n
1
n
2
n
1
+
n
2
© examsnet.com
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