tapping cups

[David King]

Francis,

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!

On a related note(pun intended):

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).

Beautiful. (And I think I can 'explain' why!)

Cheers


David King
Physics HoD
Christ's College
Private Bag 4900
Christchurch
New Zealand




On 30/06/2008, at 2:43 PM, Bryden, Francis wrote:

> When you tap a glass beaker with a spoon you get a high frequency  
> sound.
>
> Can anyone explain why the frequency drops when you pour in water
>
>
>
> Thanks ................ Francis
>
>
>
> Francis Bryden
>
> HoD Physics
>
> St Cuthbert's College
>
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>
> New Zealand                      New Zealand
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>
> ph: 64 9 5204159 ext 7808
>
>
>
> fbryden at stcuthberts.school.nz
>
>
>
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