Question

Wanda and Marita are drinking bottles of water. Each girl sounds a different musical note by blowing across the top of her bottle.

What is a good hypothesis that could lead to new experimentation?

It is more fun to play musical notes with carbonated water than with normal spring water.
If the lid on a bottle is tightly closed, then blowing across the top of the bottle will not make a musical note.
Blowing across the top of a bottle can make a musical note.
If there is less water in the bottle, then the note played is lower because there is more air to move around

Answer 1

"If there is less water in the bottle, then the note played is lower because there is more air to move around."

Why this is a good hypothesis:
- It is specific and testable (predicts how pitch changes when water level changes).
- It is falsifiable (data can show the pitch does or does not drop with less water).
- It suggests clear variables to manipulate and measure (independent: water volume; dependent: pitch/frequency).

Simple experiment to test it:
- Use the same bottle, vary the water volume in measured steps, and blow across the top the same way each time.
- Measure the note frequency with a tuner or phone app.
- Control for other factors (same bottle, same blowing force/angle if possible, same ambient conditions).
- Plot frequency vs. water volume to see whether frequency decreases as water is removed.