Flying Circus of Physics (Episode 1.6): Coffee Acoustics
Next time you’re waiting in line for a Pumpkin Spice Latte, here’s a little something to ponder – courtesy of Cleveland State University Professor Jearl Walker: When you tap a spoon inside a cup of hot water, you generate sound waves. The frequency of those waves depends on the speed of sound in the hot water. Now how do you suppose the frequency would be affected if you poured some coffee grains into the cup? All will be revealed in this super-caffeinated episode of “The Flying Circus of Physics!”
Walker, Jearl D., "Flying Circus of Physics (Episode 1.6): Coffee Acoustics" (2015). Physics Department Videos. 3.