Before adding motion, students must understand how sound behaves when standing still. A stationary
engine emitting sound produces spherical waves that spread out evenly.
π―
Task: Listen to the engine, pause the simulation, and use the ruler to measure
the wavelength (λ) in 3 directions. We will test both a Low Pitch (245
Hz) and High Pitch (490 Hz).
Conceptual Check π§
Low Frequency
High Frequency
1.The waves form perfect circles because sound travels at thein all directions.