The Physics of Sound: Bottle Flutes

What is Helmholtz resonance?

• The absorption of sound by a material.

• The tendency of air to vibrate at a specific frequency within a chamber.

• The process of sound waves traveling through a vacuum.

• The reflection of sound waves off a surface.

What is the first step in creating a bottle flute?

• Filling the bottle with water.

• Blowing across the top of an empty bottle.

• Adding food coloring to the water.

• Sealing the bottle with a cork.

How does adding water to the bottle affect the pitch of the sound produced?

• It lowers the pitch.

• It has no effect on the pitch.

• It increases the pitch.

• It makes the sound inaudible.

What happens to the column of air in the bottle as more water is added?

• It disappears completely.

• It becomes shorter.

• It remains the same length.

• It becomes longer.

How does the pitch change in a singing wine glass compared to a bottle flute as water is added?

• In both, the pitch increases.

• In the wine glass, the pitch increases; in the bottle flute, it decreases.

• In both, the pitch decreases.

• In the wine glass, the pitch decreases; in the bottle flute, it increases.