# Question

By rubbing the circular lip of a wide, thin wine glass with a moist finger, you can make the glass “sing.” (Try it.)

(a) What causes this?

(b) What would happen to the frequency of the sound if you added water to the glass?

(a) What causes this?

(b) What would happen to the frequency of the sound if you added water to the glass?

## Answer to relevant Questions

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