Answer :
(a) As they are approaching each other the frequency can be calculated by,
Here,
f0 = 2000 Hz
v0=54 Kmph =15ms-1
vs=36 kmph =10 ms-1
v=1500 ms-1
Now,
(b)
Now the frequency of 2034 Hz will act as a source frequency.
Hence,
f0 = 2034 Hz
vs=54 Kmph =15ms-1
v0=36 kmph =10 ms-1
v=1500 ms-1
Now,
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