If you have same sized glasses with different water levels and their edges are struck with a pencil which glass will peoduce high pitch

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Solution

The glass with more water in it will produce a sound of a higher pitch/frequency. This because the sound will be produced due to the vibration of the air column inside the glass. As the air column inside the more filled glass will be shorter, the wavelength of sound will automatically be lesser and the frequency will be more.

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