快猫短视频

RUNNING a finger round the rim of a wine glass to make it 鈥渟ing鈥� is annoying
enough. But if you really want to ruin everyone鈥檚 night out, reach for a martini
glass.

Andy Piacsek and Dennis Hamilton at Central Washington University in
Ellensburg made this prediction after investigating what influences the resonant
frequency of glasses. They divided 20 glasses of different sizes into three
groups depending on their shape: classical, with high, almost parallel sides;
tapered, like a martini glass; and globe, for rounder shapes.

鈥淚ntuition said the resonance would be proportional to size鈥攖he larger
the object, the deeper the pitch,鈥� says Piacsek. However, the shape of the glass
is far more important in determining the glass鈥檚 pitch, Piacsek will tell a
meeting of the Acoustical Society of America in Newport Beach, California, next
month. 鈥淭he results are tentative, but the trend is clear. What we found was
that the tapered glasses produced frequencies around 50 per cent higher than the
globe-shaped glasses,鈥� he says.

James Woodhouse at the University of Cambridge says the effect could be a
result of differences in how the glasses vibrate. Some shapes can vibrate by
simply bending, says Eastwood. But in other shapes, the glass is forced to
vibrate by stretching鈥攚hich requires more force and so produces a higher
pitch. 鈥淭his work suggests that you can鈥檛 deform a martini glass without
inducing some stretching of the glass as well,鈥� he told 快猫短视频.

The results could be bad news for those with sensitive ears. 鈥淚t can be quite
annoying when people do this with wine glasses,鈥� says Steve Papastergos of the
Met Bar in London鈥檚 Mayfair. 鈥淏ut I鈥檓 sure that at higher pitches it鈥檒l be even
飞辞谤蝉别.鈥�