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JEE Main Physics Class 11 Waves Part 1 Questions
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© examsnet.com
Question : 44
Total: 100
A stationary source emits sounds waves of frequency 500 Hz. Two observers moving along a line passing through the source detect sound to be of frequencies 4801 Hz and 530 Hz. Their respective speeds are, in ms
–
1
,
(Given speed of sound = 300 m/s)
[10 April 2019 I]
12, 16
12, 18
16, 14
8, 18
Validate
Solution:
Frequency of sound source
(
f
0
)
=
500
H
z
When observer is moving away from the source
Apparent frequency
f
1
=
480
=
f
0
(
v
−
v
0
′
v
)
........(i)
And when observer is moving towards the source
f
2
=
530
=
f
0
(
v
−
v
0
"
v
)
......(ii)
From equation (i)
480
=
500
(
300
−
v
0
′
300
)
v
0
′
=
12
m
∕
s
From equation (ii)
530
=
500
(
1
+
v
0
n
v
)
∴
V
0
"
=
18
m
∕
s
© examsnet.com
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