4/12/2024 0 Comments Background info about soundwavesThe energy of light travels through a medium called an electromagnetic field. ![]() Light, or electromagnetic radiation, also can be described as a wave. The energy from your jump moved across the puddle, but the matter (the molecules of water) only rocked back and forth. The water that splashes at the edge is a different bit of water than where your foot made contact. The water oscillates, moving back and forth, creating crests and troughs. This movement creates empty space near your foot, pulling water back inwards. The water that your foot hits moves outward, pushing on the water nearby. If you jump in a puddle, your foot pushes on the water in one spot. As the water moves up and down, the crests and troughs move to the side, carrying energy. This creates high points called crests and low points called troughs. For example, in the ocean, the water moves up and down, but returns to surface level. Some waves in nature behave like this, too. In this wave, blue particles move up and down, passing through the line in the center. But the crests and troughs do move away from your hand as the wave travels along the rope. The piece of rope touching your hand doesn’t move away from your hand. As your hand moves down, you create a low point, or trough (TRAWF). When your hand moves up, you create a high point, or crest. If you shake it up and down, you create a wave, with the rope as your medium. Imagine holding one end of a piece of rope. ![]() That medium moves back and forth repeatedly, returning to its original position. The substance that a wave moves through is called the medium. Only energy - not matter - is transferred as a wave moves. So what do all these different waves have in common?Ī wave is a disturbance that moves energy from one place to another. Light waves travel across the universe, allowing us to see distant stars. Seismic waves shake the ground during earthquakes.
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