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Chapter 15 Waves

Waves Oscillations that carry energy.
Oscillations an up and down or back and forth motion.
Vacuum space that has no matter in it.
Mechanical waves waves that move through matter
Types of Mechanical Waves Longitudinal waves Transverse waves Surface waves
Electromagnetic Waves waves of the electromagnetic field, propagating through space, carrying electromagnetic radiant energy
Types of electromagnetic Waves radio waves microwaves infrared light ultraviolet x-rays gamma rays
Wave Properties amplitude frequency period wavelength speed phase
Amplitude 1/2 of the distance between a wave's highest and lowest point.
Crest wave's highest point
Trough wave's lowest point
Resting Point line that sets half way between the highest and lowest part of the wave in which the wave intersects
Wavelength & symbol A measure from one point on one wave to the same point on the next wave.
Wavelength Units Greek letter: lambda
3 Ways to Measure Wavelength are : crest - crest trough - trough resting point - resting point
Frequency number of waves that pass a fixed point in a given time
Units for Frequency hertz (Hz)
Wave speed time it takes for a wave to move from one point to another
Wave Speed Units m/s (meters per second)
Wave speed Equation Wave speed = frequency x wavelength
Medium the type of substance which the wave is traveling through
Reflection (& example) when the wave bounces off the surface ex: mirror
Law of reflection states that a wave will reflect at the same angle that it moved toward the barrier
reflected ray the wave that is bounced off
incident ray the wave that moves towards the wall
refraction (& example) The bending of light waves as they travel through different mediums ex: when you look at something through a glass of water
diffraction (& example) bending of waves around a barrier or the spreading of waves past small openings ex: light around clouds
Interference result of waves colliding with each other
Constructive Interference waves that collide and form a bigger wave
Destructive interference waves that collide and cancel out each other
Absorption the transfer of energy from a from a wave to matter as the waves pass through it
Absorbed colors An object can absorb or not absorb color depending on the material
Reflected colors An object appears a certain color because that is the color it reflects
electromagnetic spectrum (***Know the order) Gamma rays x-rays ultraviolet visible infrared microwave radio
visible light spectrum electromagnetic waves we ca see with our bare eyes, ranges from 700- 400 nano-meters
Longitudinal wave vibrates in the same direction that the waves are moving
Expansion area of a longitudinal wave where the coils are farther apart
compression area of a longitudinal wave where the coils are closer together
intensity how much energy the sound wave carries past a certain area
units of sound Decibel dB
pitch our perception of sound frequency
analog Signal sound waves that carry information but vary continuously in both amplitude and frequency
digital signal Signals that send information as wave pulses
Created by: 2022maha



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