Student Exploration: Longitudinal Waves
Vocabulary: antinode, compression, displacement, frequency, interference, longitudinal wave,
medium, node, rarefaction, standing wave
Prior Knowledge Question (Do this BEFORE us
...
Student Exploration: Longitudinal Waves
Vocabulary: antinode, compression, displacement, frequency, interference, longitudinal wave,
medium, node, rarefaction, standing wave
Prior Knowledge Question (Do this BEFORE using the Gizmo.)
In many science fiction movies, an evil alien spaceship explodes with an enormous KABOOM!!
Suppose you were floating in space at a safe distance from a large explosion such as the
supernova at left. Do you think you would hear anything? Explain.
No, I don't think you would hear anything because there is no medium that sound can travel in
space.
Gizmo Warm-up
No sounds can be heard in outer space because sound waves require a medium, such as air, to
travel through. Sound waves are examples of longitudinal waves, or waves in which particles
move back and forth in the same direction as the wave.
You can use the Longitudinal Waves Gizmo to explore the behavior of sound waves. In the
Gizmo, an air-filled tube contains 24 evenly-spaced, airtight dividers. To begin, select the
Pulsed waves setting and the Open tube. Set the Strength to 1.00. Deselect the graph options
at lower right.
1. Click Play ( ) to set off the firecracker by the left end of the tube. What do you see?
The 24 evenly-spaced airtight dividers are moving side to side, slowly.
2. Do any individual air molecules travel the length of the tube? Yes, individual air molecules
travel the length of the tube.
How do you know? Because the tube is open, which means nothing is blocking the air
molecules.
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