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### 14 Cards in this Set

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 What is Matter? Anything that has mass and occupies space. Waves which travel through matter are Mechanical Waves. What are the the two ways energy can move? Either two objects collide, or objects vibrate and produce vibrations. What is a wave? A wave is the disturbance created by vibrations. All waves are produced by vibrations. What are Electromagnetic waves? Waves which don't have to pass through a medium. What are some examples of Mechanical Waves? Radio Waves, Microwaves, infrared rays, visible light, ultraviolet rays, X rays, and gamma rays. How does the speed of sound vary? The sound waves vary through solids, liquids, and gases by traveling faster through a solid medium (ground) than through air.This is because the speed of sound is determined by how closely the particles in a medium are packed together. Sound waves travel from one particle to the next, so the closer the particles, the faster the sound travels. Particles in the ground are much closer to each other than those in the air, so sound travels faster through the ground than it does through the air. What is Frequency? What is Hertz? Frequency is when you count the number of crests that pass a given point in a second. Frequency is measured in Hertz, which is: One Hertz= One Wave per second What is the difference between constructive and destructive inferences? List an example of each. Constructive inference is when the crests of 2 waves arrive in the same place at the same time to make a larger wave. And example of this is if you blow over the top f a soda bottle. When the whistles are the same, they add together to make a larger sound. Destructive inferences is when the crest of once wave and the trough of another arrive at the same place at the same time, but it results in a smaller wave being formed or the wave is cancelled out. An example is if you take the soda bottles, and the whistles are different, the sound becomes quieter. What is Diffraction? Diffraction is when a wave bends around a barrier. An example of this is that in class we put a wave machine in a pool of water. Then, we put two blocks in front of the waves. The waves bent around the cracks between the two blocks, and continued going. What is Reflection? Reflection is when a wave bounces off a surface. An example of this is mirrors. Why can't we hear in space? Sound waves need a medium to travel through, and there is no medium in space. Light waves, however, don't need a medium and therefore can be seen in space. What is Sonar? A sensory system in certain animals, such as bats and dolphins, in which usually high-pitched sounds are emitted and their echoes interpreted to determine the direction and distance of objects What is echolocation? A sensory system in certain animals, such as bats and dolphins, in which usually high-pitched sounds are emitted and their echoes interpreted to determine the direction and distance of objects What is an echo? Repetition of a sound by reflection of sound waves from a surface.