A car is moving with a constant velocity 10 m/s towards a stationary wall. An observer in between the car and the wall is moving with a constant velocity 2 m/s towards the stationary wall. The car blows a horn of frequency 320 hz. The velocity of sound in air is 330 m/s. The beats frequency received by the observer is ....... Hz
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Answer:
Frequency heard by wall
where car is source and wall is object
f
wall
=f
d1
V
S
−V
C
V
S
(i)
now the reflected sound heard by driver
in this case wall is source and car is object
f
d2
=f
wall
V
S
V
S
+V
C
(ii)
Using equation (i) and(ii)
f
d2
=f
d1
V
S
−V
C
V
S
+V
C
f
d2
=400
340−10
340+10
=400×
330
350
=424Hz
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