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[{VerifyArticle user='eertl' template='Standard' date='27. Juni 2014' page-date='2014' comment='Überprüft, nach Sexl, R.U., Kühnelt, H., Stadler, H., Jakesch, P., Sattlberger, E., Physik 5' funder='44' }]
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!!!License Information of Images on page
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| A440 in staff notation. Created by Hyacinth ( talk ) using Sibelius 5.See: File:A440.mid| Übertragen aus en.wikipedia nach Commons durch Innotata mithilfe des CommonsHelper .| Hyacinth in der Wikipedia auf Englisch| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:A440.png
| Three flashing lights, from lowest frequency (top) to highest frequency (bottom). f is the frequency in Hertz ("Hz"), meaning the number of flashes per second. T is the period in seconds ("s"), meaning the number of seconds per flash. T and f are always inverses.| Eigenes Werk| Sbyrnes321| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:FrequencyAnimation.gif
| | | | [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:Wiktfavicon en.svg
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