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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