Question

IF YOU GET GOOD GRADES ON TEST PLEASE HELP

sarah hears the siren of an ambulance that is moving toward her. if the actual frequency of the siren is 2000 hertz; which frequency was heard by sarah?
A. 1900
B. 2000
C 1000
D. 2100
( please be 100% sure with your answer )

Answer 1

a. 1900 hertz everything else it either to big or to little

Answer 2

A. 1900

Step-by-step explanation:

Because if the ambulance is still approaching her, it means that she has not yet heard the full frequency of the ambulance. And it wouldn't be 1000 because otherwise she wouldn't be hearing the siren.