That's the answer. The water damps out vibrations , so it is only really the glass above the water that is vibrating. And just like a drum or a glockenspeil, smaller means higher in pitch.daniel_i_l said:Maybe the amount of water changes the resonant frequency of the glass itself?
When a glass is filled with liquid, the mass and density of the glass changes. This change in mass and density affects the way the glass vibrates when struck, resulting in a change in the pitch of the sound produced.
The more liquid that is added to the glass, the heavier and denser it becomes. This increase in mass and density causes the glass to vibrate at a slower rate, resulting in a lower pitch. Conversely, less liquid in the glass means it is lighter and less dense, causing it to vibrate at a faster rate and produce a higher pitch.
Yes, the type of liquid in the glass can also affect the sound wave pitch. Different liquids have different densities, which can cause the glass to vibrate at different rates and produce different pitches. For example, water is less dense than syrup, so filling a glass with water will result in a higher pitch than filling it with syrup.
Yes, the shape of the glass can also play a role in the sound wave pitch. Glasses with wider openings or flared shapes will have a lower pitch compared to glasses with narrower openings. This is because the wider the opening, the more air can escape and the slower the glass will vibrate, resulting in a lower pitch.
Yes, the scientific explanation for this phenomenon lies in the concept of resonant frequency. When a glass is struck, it vibrates at its natural frequency, which is determined by its mass, density, and shape. When liquid is added, it changes these factors and affects the glass's resonant frequency, resulting in a change in pitch. This is similar to how changing the length of a guitar string or the size of a drum affects their respective pitches.