Από τη Βικιπαίδεια, την ελεύθερη εγκυκλοπαίδεια
	    
	    	    	    
	    
Shows waves emitting from a moving object.
Uploaded to english Wikipedia 10.2.2005 by Pfalstad. He writes "I hereby release it to the public Domain."
|  | This image has been released into the public domain by its author, Pfalstad. This applies worldwide. 
 In some countries this may not be legally possible; if so:Pfalstad grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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