Doppler Effect

When an automobile moves towards the listener, the sound of its horn seems relatively:

• low pitched

• high pitched

• normal

When an automobile moves away from the listener, its horn seems relatively:

• low pitched

• high pitched

• normal

When an automobile is at rest next to the listener, the sound of its horn seems relatively:

• low pitched

• high pitched

• normal

The changed pitch of the Doppler Effect is due to changes in:

• wave speed

• wave amplitude

• wave frequency

Which of the following scenarios would produce the Doppler Effect (aka a shift in pitch)? Check all that apply.

• A moving sound source and a stationary observer (such as an airplane passing overhead)

• A moving observer and a stationary source (such as a person running past a loud stereo)

• A moving source and moving observer (such as kids chasing an ice cream truck that is playing music)

• A non-moving source and non-moving observer (such as person watching television on a couch)