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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)