Khan Academy: When the Source and the Wave Move at the Same Velocity

Wave goodbye to the same old demonstrations for alternative energy sources, and wave hello to this one investigating ocean waves! Using a water bottle to create an oscillating water column, learners see and possibly hear how the...

Learn how flu viruses get into and out of your cells using Hemagglutinin and Neuraminidase proteins on their surface. Rishi is a pediatric infectious disease physician and works at Khan Academy. These videos do not provide medical advice...

Looks at what happens when the velocity of the source is equal to the velocity of the wave. [7:35]

Test yourself on the topics of identifying the characteristics of a longitudinal or transverse wave such as the wavelength, crest, and areas of compression with this multiple choice quiz.

A site for students to practice viewing two sound waves interference and analyze the patterns formed.

A video lecture investigating when two waves superpose to create a resultant wave. This phenomenon called interference is discussed in detail in this video including what happens in constructive and destructive interference. Also learn...

This video teaches the viewer how to read a position vs. time graph. It explains how to use the graph to determine the following quantities: displacement, distance, average velocity, average speed, instantaneous velocity, and...

This video illustrates and explains how seismic waves function. These waves are broken down into two types: surface and body. Take a look into why waves help understand the structure of Earth. [8:38]

This video lecture will introduce the concepts of transverse and longitudinal waves. [13:02]

Get a clearer idea of what a "Depolarization Wave" means and how it goes from cell to cell through the entire heart! Rishi is a pediatric infectious disease physician and works at Khan Academy. [11:44]