Answer to Question #162316 in Physics for PAVITRA

Question

Blowing across the top of an empty soda bottle, a relatively loud sound can be created because a standing wave develops in the bottle. When water is filled at different levels in the bottle, different pitches are heard depending on the level of water filled. Explain this concept of changes of pitch when water is filled into the bottle

Answer 1

This happens because the free space inside the bottle decreases as it fills with water, which causes change in wavelength inside the bottle's free space. If the water is filled continuously, resonance may occur.