resonance standing wave wine glass a science with bobert video short

Dr. Smith has a wine glass that has no decorations and very thin walls. Such a wine glass will give a loud and clear sound when tapped and will create standing waves in the glass. However, creating standing waves in a wine glass is not as easy as it looks. rubbing a dry finger along the rim of the glass provides too much rubbing a very wet finger does not have enough friction. Rubbing too fast does not work. rubbing too slow does not work eitherThe finger must be rubbed along the rim