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45 Cards in this Set

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 Medium Material through which waves travel (Mechancial waves require one, but electromagnetic don't) Waves Transfer of energy from one place to another that carry energy not matter Mechanical Waves Sound, ocean waves, waves in a rope Electromagnetic Waves Light, microwaves, x-rays, radio/televisions Longitudinal Waves Move back and forth Transverse Waves Move up and down Rest Position/ Line of Origin The center line of a wave Crest High point of a transverse wave Trough Low point of a transverse wave Wavelength Distance from one point on a wave to the same point on the next Amplitude Distance from a crest or trough to the line of origin Rarefaction Less dense area of a longitudinal wave Frequency # of waves that pass a given point at one second Hertz Measure of frequency Compression More dense area of a longitudinal wave Higher Frequency = __ Energy Greater Greater Amplitude = __ Energy Greater Speed of a Wave Formula Speed= Wavelength * Frequency (V=(upside down y)*F) Reflection Action of light/sound bouncing off a medium (mirror, echo) Refraction Bending of waves as they enter a new medium (Pencil appears broken in liquid) Diffraction Breaking of waves as they hit a new medium (Waves hitting long and splitting) Constructive Interference 2/more waves combine energy when they meet (Crests & troughs on same side of line of origin) Destructive Interference 2/more waves cancel out their energy when they meet (Crests & troughs on opposite sides of line of origin) Denser Medium with ___ Speed of a Wave Slower because has more inertia More Elastic Medium, ___ Speed of a Wave Faster Interference Interaction of 2/more waves that arrive at the same place at the same time Ultrasonic Sounds with a frequency above the range of human hearing (>20000 Hz) Light Form of visable energy that travels in transverse waves (Part of electromagnetic spectrum) Examples of Radiation w/ Lower Frequency than Light TV/Radio waves, microwaves, infrared waves Examples of Radiation w/ Higher Frequency X-rays, gamma rays, ultraviolet waves How Light Travels In 1 direction, 1 straigh line Transmitted Light Passes through an object (window, windshield) Absorbed Light Turns into heat energy (black clothes) Photons Light particles Opaque Object Light is completely blocked Transparent Object Light can go through Translucent Object Some light goes through, but not all Light Travels __ in Air than Water/Stone Faster because air is less dense Light Composed of: All rainbow colors (ROYGBIV) Sound Energy that starts with a vibration and travels in longitudinal waves through a medium Echolocation Process of finding differenct objects using sound waves Mach One Speed of sound Supersonic Anything that travels faster than the speed of sound in air Sound travels __ in Stone/Water than Air Faster because more dense so molecules collide more often and spread energy quicker Decibels (dB) Measure of amplitude (Determines loudness)