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 )

This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.