Apparent frequncy of sound heard?

[desmond iking]

Homework Statement

A car is moving in a straight line at 30m/s approaches a stationary source which emits sound of frequency 5000hz. If the speed of sound is 330m/s . The apparent frequncy received by car is ((330+30)/ 330) x 5000= 5455hz.
What 's the frequency reflected form the car? the ans given is 6001hz.

why not the frequency received by the car = frequency of sound reflected by the car? which means the apparent frequency reflected form the car is also = 5455hz?

Homework Equations

The Attempt at a Solution

 

[olivermsun]

The reflected sound is at the frequency you say, but only when "heard" from the car. The car itself is a source moving with respect to the medium, in the direction of the emitted (reflected) sound.