A bullet passes past a person at a speed of 220 m/s. Find the fractional change in the frequency of the whistling sound heard by the person as the bullet crosses the person. Speed of sound in air = 330 m/s.

As the bullet reaches the person, the frequency received by the person is given by,



Here,


v= 330 ms-1


vs= 220 ms-1



As the bullet goes by, the frequency received by the person is given by,




Hence, the fractional change will be,




1