Rachel Pomeroy tries to be as engaging as one can be when reviewing physics concepts with high schoolers on the eve of summer vacation.
The veteran teacher projects images of an “open” sign and an incandescent bulb and a sunset, instructing the 20 or so teens to judge whether the light the objects emit comprises multiple colors. She later plays a humming noise, and then another. “Doubt you can hear the difference,” she says. Separately, the noises sound identical. But when Pomeroy plays the files at the same time, a pulse erupts every few beats. That, she explains, is constructive interference.
