This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Phase drift. wave with phase drift and copy of itself delay by two coherence times Transferred from org en transferred to Commons by User Shizhao using de php CommonsHelper Original uploader was Lundeen at org en Released into the public domain by the author en Lundeen graph Original upload log page en Phasedrift Lundeen