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JEE Advanced Model Paper 18 with solutions for online practice
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© examsnet.com
Question : 2
Total: 60
A car is fitted with a device which transmits sound 60 times per minute. There is no windand speed of sound in still air is 345 m/s. If you hear the sound 68 times per minute,when you are moving towards the car with a speed of 12m/s , the speed of the car mustbe
20.0 m/s towards you
30.0 m/s towards you
10.0 m/s away from you
10.0 m/s towards you
Validate
Solution:
f
app
=
(
V
+
V
0
V
−
V
0
)
f
0
, assuming car moving towards us .
∴ 68 =
(
345
+
12
345
−
V
c
)
60 =
V
c
= 30 m/s
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