Question

materials: poptube
procedures:

1. condense the poptube so that each crease is fully folded.
2. slowly and gradually pull the pop tube apart.
3. slowly and gradually condense and fold the pop tube together again.
4. observe how the sound changes as you pull apart and fold together the pop tube.

questions:

1. explain what you hear happening as you pull apart the poptube?

deep popping sound thats loud.

1. explain what you hear happening as you condense and fold the pop tube together?

a loud popping sound that is loud

1. what property of sound waves is changing?

frequency and wavelength

Explanation:

The problem involves observing sound changes with a PopTube, related to sound wave properties. In physics (Natural Science subfield), sound waves have properties like frequency (pitch), wavelength, amplitude (loudness), etc. When manipulating the PopTube, the key changing property here (considering the context of the experiment and typical sound - PopTube interactions) is frequency (and related wavelength, but frequency is a primary property related to pitch changes, though amplitude (loudness) could also be considered, but the answer here focuses on frequency and wavelength. However, the most central property related to the "sound change" in terms of pitch (which is often the focus in such tube - related sound experiments) is frequency. But based on the given answer, we analyze: When pulling or folding the PopTube, the air column inside changes, affecting the frequency (and wavelength, as \(v = f\lambda\) where \(v\) is speed, \(f\) frequency, \(\lambda\) wavelength) of the sound waves produced. So the property changing is frequency (and wavelength as a related property).

Answer:

frequency and wavelength