Longitudinal Waves Gizmos Worksheet Answers 100 Percent Correct

Longitudinal Waves Gizmos Worksheet Answers 100% Correct

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 you hear anything? Explain. I don’t think so, I think the sound doesn’t have anything to vibrate to make the noise 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 GizmoTM 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 wave oscillates left to right and then back, and then dips below 0 on the second round and every other one after. 2. Do any individual air molecules travel the length of the tube? How do you know? I think they do, the airtight dividers don’t block the air molecules from travelling through.

Introduction: When you strike a tuning fork on a hard surface, the tines of the fork start to vibrate back and forth at a certain frequency, or number of cycles per second. This motion causes nearby molecules to move back and forth, creating sound waves. The greater the frequency of the sound wave, the higher pitched the sound will be. Question: What happens to air as a sound wave passes through it? 1. Observe: Click Play, and then click Pause ( ) after about 70 simulated milliseconds (does not have to be exact). Sketch the current positions of the dividers below. I don’t know how to draw on that picture, but it is tight at the beginning and then spreads out and then becomes tight again. (compression>rarefaction>compression) 2. Identify: Longitudinal waves have two important features. Compressions are regions where particles are squished together. Rarefactions are regions where particles are spread apart. In your diagram above, draw a red rectangle around each compression and a blue oval around each rarefaction. (Note: The dividers were originally spaced one meter apart.) 3. Observe: Turn on the Displacement graph. The displacement of a divider is equal to the change from its original position. The original positions of the red and green dividers are shown by the red and green dots below the tube. In which direction has the red divider moved? The green divider? The red divider has moved to the right and the green divider has moved to the left.