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JEE Main Physics Class 11 Waves Part 1 Questions
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© examsnet.com
Question : 61
Total: 100
A source of sound emits sound waves at frequency
f
0
. It is moving towards an observer with fixed speed
v
s
(
v
s
<
v
,
where
v
is the speed of sound in air). If the observer were to move towards the source with speed
v
0
,
one of the following two graphs (A and B) will given the correct variation of the frequency
f
heard by the observer as
v
0
is changed.
The variation of f with
v
0
is given correctly by :
[Online April 11, 2015]
graph A with slope
=
f
0
(
v
+
v
s
)
graph B with slope
=
f
0
(
v
−
v
s
)
graph A with slope
=
f
0
(
v
−
v
s
)
graph B with slope
=
f
0
(
v
+
v
s
)
Validate
Solution:
According to Doppler’s effect,
Apparent, frequency
f
=
(
V
+
V
0
V
−
V
S
)
f
0
Now,
f
=
(
f
0
V
−
V
S
)
V
0
+
V
f
0
V
−
V
s
So, slope
=
f
0
V
−
V
S
Hence, option (c) is the correct answer.
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