উইকিপিডিয়া, মুক্ত বিশ্বকোষ থেকে
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."
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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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