Interference is what makes soap bubbles and peacock feathers look so colorful. When peaks meet up with troughs, the peaks and troughs cancel out, creating a smaller wave and dimmer light. He showed that when the peaks of two waves line up, they add together, creating a bigger wave and brighter light. A scientist named Thomas Young demonstrated this really well in a famous experiment called the “ two slit experiment”. Interference happens when two waves meet in the same space and affect each other. Wavelength is the distance between one peak in the wave and the next. Team Light replies, “Light travels as a wave, with high peaks and low troughs just like waves on the ocean. She then asks, “Could you please explain what those words mean?” “Correct!” says the referee, giving Team Light a point. Looking around proudly, the captain adds, “This means we can experience interference or diffraction.” Team Light is the first to hit the buzzer. The referee introduces the rules: teams score points by telling the audience about things that make their topic special. On the right is “Team Sound,” wearing DJ hats and t-shirts with musical notes. On the left side is “Team Light,” wearing t-shirts with an image of a lightbulb. There are two teams of three people each, sitting at desks facing each other, with a referee in between them. Imagine being in the audience at a TV studio, waiting for a quiz show to start. The future of shaping and designing sound is in the making! Maybe someday, sound experts will even teach something to light experts! We will tell you about acoustic metamaterials, an emerging technology that is quickly becoming part of our loudspeakers, our shows, our cars, our public spaces, and our hospitals-all the places where we want control over sound and noise. So, why do we not have lenses or displays for sound? Or do we? This article will tell the story of how sound technology is catching up with light technology. Light and sound are very similar: they are both waves, and they both have particles associated with them. Lenses and holograms are part of our everyday lives. The science of light manipulation started with the ancient Greeks, so we have had many years to develop it.
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