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Francis,<div><br></div><div>The naked scientist covered this on a podcast some time back...wish I could remember the answer. And I am completely flummoxed by David H's being the reverse!</div><div><br></div><div>On a related note(pun intended):</div><div><br></div><div>Get a metal wire rack from an oven. Hold it in a vertical plane. Tie strings to the top left and top right corners. Wrap the strings around you right and left index fingers respectively, so you are holding the rack up by the strings. Stick your index fingers in your ears. Get a helper to hit the rack with a wooden spoon (or some such).</div><div><br></div><div>Beautiful. (And I think I can 'explain' why!)</div><div><br></div><div>Cheers</div><div><br></div><div><br></div><div>David King<div><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="">Physics HoD</div><div style="">Christ's College</div><div style="">Private Bag 4900</div><div style="">Christchurch</div><div style="">New Zealand</div><div style="font-size: 12px; "><br class="khtml-block-placeholder"></div><div style="font-size: 12px; "><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span> </div><br><div><div>On 30/06/2008, at 2:43 PM, Bryden, Francis wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;">When you tap a glass beaker with a spoon you get a high frequency sound. </font></div> <br> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;">Can anyone explain why the frequency drops when you pour in water</font></div> <br> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;"> </font></div> <br> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;">Thanks <i>................ Francis</i></font></div> <br> <div align="left" style="text-align:left;"><font face="Comic Sans MS" size="+0" color="#000000" style="font-family:Comic Sans MS;font-size:11pt;color:#000000;"> </font></div> <br> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;"><i>Francis Bryden</i></font></div> <br> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;"><i>HoD Physics</i></font></div> <br> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;"><i>St Cuthbert's College</i></font></div> <br> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;"><i>122 Market Rd or Box 26 020</i></font></div> <br> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;"><i>Epsom Epsom</i></font></div> <br> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;"><i>Auckland 1051 Auckland 1344</i></font></div> <br> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;"><i>New Zealand New Zealand</i></font></div> <br> <div align="left" style="text-align:left;"><font face="Comic Sans MS" size="+0" color="#000000" style="font-family:Comic Sans MS;font-size:11pt;color:#000000;"> </font></div> <br> <div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;"><i>ph: 64 9 5204159 ext 7808</i></font></div> <br> <div align="left" style="text-align:left;"><font face="Comic Sans MS" size="+0" color="#000000" style="font-family:Comic Sans MS;font-size:11pt;color:#000000;"> </font></div> <br> <div align="left" style="text-align:left;"><a href="mailto:fbryden@stcuthberts.school.nz"><font face="Arial" size="+0" style="font-family:Arial;font-size:10pt;"><i>fbryden@stcuthberts.school.nz</i></font></a></div> <br> <div align="left" style="text-align:left;"><font face="Comic Sans MS" size="+0" color="#000000" style="font-family:Comic Sans MS;font-size:11pt;color:#000000;"> </font></div> <br> <br> <div align="left" style="text-align:left;"><font face="Times New Roman" size="+0" color="#000000" style="font-family:Times New Roman;font-size:12pt;color:#000000;"> </font><font face="Webdings" size="+0" color="#008000" style="font-family:Webdings;font-size:11pt;color:#008000;"><b>P </b></font><font face="Verdana" size="+0" color="#008000" style="font-family:Verdana;font-size:10pt;color:#008000;"><b>Please consider the environment before printing this email</b></font></div> <br clear="all"><hr noshade="" size="1" width="100%" color="#000000" style="color:#000000; background-color:#FFFFFF; visibility:visible; margin-top:0px;"> <br> <div align="left" style="text-align:left;"><font face="Times New Roman" size="+0" color="#000000" style="font-family:Times New Roman;font-size:12pt;color:#000000;">This message (and any associated files) is intended only for the </font></div> <div align="left" style="text-align:left;"><font face="Times New Roman" size="+0" color="#000000" style="font-family:Times New Roman;font-size:12pt;color:#000000;">use of the individual or entity to which it is addressed and may </font></div> <div align="left" style="text-align:left;"><font face="Times New Roman" size="+0" color="#000000" style="font-family:Times New Roman;font-size:12pt;color:#000000;">contain information that is confidential, subject to copyright or</font></div> <div align="left" style="text-align:left;"><font face="Times New Roman" size="+0" color="#000000" style="font-family:Times New Roman;font-size:12pt;color:#000000;">constitutes a trade secret. 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