Ever wonder why a siren sounds different when it's coming toward you than when it's going away from you? It all depends on the motion of the sound waves! The interactive activity demonstrates how the Doppler effect impacts the motion of...

Students explore the Dollper effect by finding the frequency and velocity of sound.  In this velocity instructional activity, students determine the impulse during a collision by using their data and a software program.

Ninth graders explain waves in terms of energy transfer and describe their basic types and characteristics. They solve mathematical problems involving wavelength and frequency. Students conduct experiments in reflection and refraction.

Students view video segments which reveal the parts of sound and what factors control sound. The viewing and post-viewing activities serve to reinforce the video segments using worksheets and hands-out experiments.

Young scholars practice manipulating algebra formulas with more than one variable. They examine the topics of velocity, wavelength and frequency. They determine the amount of red-shift in a receding star.