When an automobile moves towards a listener, the sound of its horn seems relatively __________. Click on the choice(s) below that correctly complete this statement.
low pitched
high pitched
normal
Click on each statement about the Doppler Effect that is TRUE.
A. It occurs when a wave source moves towards an observer.
B. It occurs when an observer moves towards a wave source.
C. It occurs when a wave source moves away from an observer.
D. It occurs when an observer moves away from a wave source.
Two ambulances have their sirens on and emit sound of the SAME frequency. Both ambulances are the same distance away from an observer but approach the observer from different directions and at different speeds. The ambulance with higher lower( higher, lower ) speed will be heard by the observer to have the lower pitched sound.
