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# Light and Sound Wave

### Vocabulary

TermDefinition
Waves Oscillations that carry energy
Oscillation 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 1. Waves from speedboat 2. Talking
Types of Electromagnetic waves 1. X-rays 2. Radio Waves
Electromagnetic waves Waves that travel in a vacuum
Wave properties Amplitude, crest, trough
Amplitude one half the distance between a waves high point
Crest highest point
Trough lowest point
Resting point Position the medium would take if there was no wave
Wavelength and symbol Measure of a point on one wave to a point on another wave. Greek symbol for lambda
3 ways to measure wavelength Crest to crest. through to through
wavelength units meters
Frequency number of waves that pass a fixed point in a given unit of time
Units for frequency Hertz
Wave Speed Time it takes to move from one point to another
Wave speed units Meters per second
Wave speed equation V = f x wavelength
Medium Makes the transfer of one substance to another possible
Reflection When a wave bounces off of something (Looking in a mirror)
Law of Reflection Waves reflecting at the same angle as the angle that it moved toward the barrier
Reflected Ray A ray of light or another form of radiant energy which is thrown back from a non absorbing surface
Incident Ray A ray of light that strikes a surface
Refraction The bending of waves as they travel through different mediums. (Distorted light waves of a pencil in water.)
Diffraction The bending of waves around a barrier or the spreading of waves past small openings. (Ocean waves coming through pier.)
Interference Result of waves colliding with e/o
Constructive interference Waves colliding to form a larger wave
Destructive interference Waves interfering with e/o and cancelling e/o out
Absorption Wave passing through a substance
Absorbed colors An object that appears a certain color reflects the light frequency that corresponds to that color, and it absorbs all the other frequencies in the visible light spectrum.
Reflected colors colour reflected by the object is the colour perceived
Electromagnetic spectrum Ranges in wavelengths from thousands of meters to a trillionth of a meter long
Visible light spectrum light that humans can see between 400-700 nano meters
longitudinal wave Oscillates in the same direction as it means
expansion a group of waves far apart
compression a group of waves close together
intensity (of sound) how much energy a sound wave carries past a certain area
units of sound a unit of perceived loudness
pitch perception of sound frequency
analog signal carry info but vary continuously in both amplitude and frequency
digital signal send info as wave pulses and communicate only through 1s and 0s so the form that the information takes is much simpler
Created by: 2022emlu

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