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Physical Science 3/9
| Term | Definition |
|---|---|
| Waves | oscillation that carries energy |
| Oscillation | an up or down, back or forth motion |
| Vacuum | Space that has no matter in it |
| Mechanical Waves | Waves that move through matter |
| Types of Mechanical Waves | transverse and longitudinal waves |
| Electromagnetic Waves | Waves that move through vacuums |
| Types of Electromagnetic Waves | light waves, x-rays, radio waves |
| Wave Properties | Amplitude, Wavelength, Frequency, Wave Speed |
| Amplitude | One half of a distance between a waves high point |
| Crest | Wave's high point |
| Through | Wave's low point |
| Resting Point | the position where the medium would take place if there were no wave |
| Wavelength and Symbol | measured from one point on a wave to the same point of another wave. lambda |
| Wavelength Units | meters |
| 3 Ways to Measure Wavelengths | crest-to-crest trough-to-trough resting point-to-resting point |
| Frequency | the number of waves passed through a fixed point in a certain amount of time |
| Units for Frequency | Hz |
| Wave Speed | the time it takes for a wave to move from one to another |
| Wave Speed Unit | v |
| Wave Speed Equation | v=f x lambda |
| Medium | a substance that makes it possible for energy to go from one place to another |
| Reflection (example) | When a wave bounces off a surface. when you look into a mirror |
| Law of Reflection | waves being reflected in a particular way |
| Reflected Ray | when it bounces off the barrier |
| Incident Ray | when a wave moves towards the barrier |
| Diffraction (example) | the bending of waves around a barrier. when ocean waves come to a pier |
| Refraction (example) | caused by waves traveling at different speeds through different mediums. legs looking short in a pool |
| Interference | waves colliding with each other |
| Constructive Interference | when waves collide and cause of bigger wave |
| Destructive Interference | when they collide and cancel each other out |
| Absorption | the transfer of energy from a wave to matter as a wave passes through it |
| Absorbed Colors | all the colors are absorbed and we only see one color |
| Reflected Colors | the color we see when all other colors are absorbed |
| Electromagnetic Spectrum | radio waves > microwaves> infrared> visible light>ultra violet> x-rays>gamma rays |
| Visible Light Spectrum | what we can see from 700 nanometers to 400 nanometers |
| Longitudinal Wave | a wave that oscillates in the same direction it moves |
| Expansion | how far apart the waves are |
| Compression | how close the waves are |
| Intensity | how much energy a sound wave carries through a certain spot |
| Units of sound | dB |
| Pitch | our perception of the sound waves frequency |
| Analog Signal | carry information continuously but vary in amplitude and frequency |
| Digital Signal | send information as wave pulses |
Created by:
dyllan2003
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