From the case:
Doppler effect (diagrams)
{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_examine_pipeline_reports":false,"can_pin":false},"extraPropsURL":"/studies/143941/annotated_viewer_json?lang=us"}
Case Discussion
Diagrams of the change in wavelength of a source (or observer) of sound waves known as the Doppler effect.